How to Choose an SAP S/4HANA Migration Partner in the UK

A practical guide to choosing the right SAP S/4HANA migration partner for UK businesses, covering expertise, data, integration, methodology, costs, and support.

Moving to SAP S/4HANA is not simply a technical upgrade. Whether an organisation is migrating from SAP ECC, another ERP platform, or a fragmented legacy landscape, the transformation can affect business processes, data, integrations, custom developments, users, infrastructure, and the long-term operating model.

That makes the choice of an SAP S/4HANA migration partner one of the most important decisions in the programme.

The right partner should do more than configure SAP. It should be able to assess the existing landscape, recommend the right transformation approach, manage data and integrations, address customisation and technical debt, support business change, and take responsibility for a controlled transition to the target SAP environment.

For UK organisations, there are additional considerations. Companies may need a delivery model that combines UK-based business engagement with distributed SAP expertise, while accounting for UK localisation, regulatory requirements, existing supplier relationships, and the complexity of multinational operations.

This guide explains what to look for in an SAP S/4HANA migration partner, whether you are transitioning from SAP ECC, another ERP, or an existing SAP landscape, how to compare providers, what questions to ask, which red flags to watch for, and how to structure an SAP migration RFP.

Short Answer: When choosing an SAP S/4HANA migration partner, UK organisations should look for proven S/4HANA transformation experience, data and integration expertise, Clean Core capabilities, AI and automation expertise, a clear migration methodology, and strong testing and cutover support. Need help selecting the right partner for your transformation? Talk to our SAP experts.

Choosing an SAP Migration Partner: The 10 Things to Evaluate

Choosing an SAP migration partner is a major decision. The right provider can make an S/4HANA transformation more predictable and easier to manage. The wrong one can add complexity to an already difficult programme.

It is therefore worth looking beyond the size of a consulting company or the number of SAP projects it lists on its website. What matters is whether the partner has experience that is relevant to your organisation, understands the starting SAP landscape, and can manage the technical and business issues that are likely to arise during the migration.

Before comparing individual SAP consultancies and system integrators, define the criteria you will use to evaluate them.

The main areas to consider are:

1. SAP S/4HANA migration experience
2. Migration methodology
3. Business and industry expertise
4. Data migration capabilities
5. SAP integration expertise
6. Clean Core and custom-code strategy
7. UK delivery model
8. The actual project team
9. Commercial transparency
10. Post-go-live support

These criteria should be considered together. Strong SAP credentials alone do not guarantee that a partner is suitable for a particular transformation.

The objective is to identify the partner that can reduce transformation risk while delivering the required business and technical outcomes.

1. Evaluate SAP S/4HANA Migration Experience

Start with a simple question:

Has the partner delivered projects similar to yours?

Working with SAP is not the same as having extensive experience with S/4HANA migration. The risks and requirements can vary considerably depending on the existing ERP environment, business model, data volumes, level of customisation, and number of countries involved.

Ask potential partners about their experience with:

• SAP ECC to S/4HANA migrations;
• non-SAP ERP migrations;
• system conversions;
• new S/4HANA implementations;
• Selective Data Transition;
• SAP S/4HANA Cloud Public Edition;
• SAP S/4HANA Cloud Private Edition;
• multi-country programmes;
• complex integrations;
• large or difficult data sets;
• highly customised SAP environments;
• post-go-live stabilisation.

The number of projects is less important than their relevance.

For example, a partner may have completed dozens of SAP implementations, but if none involved a highly customised manufacturing environment with multiple plants and legacy integrations, that experience may not tell you much about the risks of your own programme.

Ask partners to explain what happened on previous projects, not just what they delivered. Find out where projects encountered difficulties, how migration decisions were made, and how unexpected problems were handled.

Customer references can also be useful. Ideally, speak to organisations with a similar SAP landscape, industry, geographic footprint, or transformation objective.

2. Assess the Migration Methodology

There is no single SAP S/4HANA migration approach that is right for every organisation.

The starting point should be an assessment of the existing ERP environment and the future business requirements. This includes business processes, data, custom developments, integrations, organisational structures, and the target operating model.

The main approaches are system conversion, new implementation, and Selective Data Transition.

System Conversion

A system conversion, often referred to as a Brownfield approach, allows an organisation to move an existing SAP environment to S/4HANA while retaining a significant part of its existing configuration and processes.

It can make sense when:

• current business processes work well;
• there is significant SAP functionality worth retaining;
• the organisation wants to minimise disruption;
• a complete process redesign is not required;
• historical data needs to remain available within the new environment.

The main concern is that conversion can also carry old problems into S/4HANA. Unnecessary customisations, outdated processes, and technical debt do not become useful simply because the underlying ERP has been upgraded.

New Implementation

A new implementation, or Greenfield approach, creates a new S/4HANA environment based on the organisation's future requirements.

This approach may be worth considering when the existing ERP environment has:

• extensive customisation;
• inconsistent processes;
• obsolete functionality;
• poor-quality master data;
• significant technical debt;
• different processes across business units or countries.

It is also a common option for organisations moving from a non-SAP ERP system.

The advantage is greater freedom to redesign processes. The trade-off is that the transformation usually requires more business involvement and change management.

Selective Data Transition

Selective Data Transition sits between a full conversion and a completely new implementation.

It can be useful when an organisation wants to retain certain data, processes, or organisational structures while redesigning other parts of the ERP environment.

This approach can be particularly relevant for companies dealing with:

• multiple ERP systems;
• acquisitions and divestments;
• business restructuring;
• ERP consolidation;
• phased transformations;
• specific historical-data requirements.

The important point is that the partner should recommend an approach based on the organisation's requirements. A provider should be able to explain why one option is more appropriate than another and what the trade-offs are.

3. Look for Business and Industry Expertise

S/4HANA migration affects much more than the IT department.

Changes to ERP processes can affect production, procurement, finance, logistics, customer service, supply chain operations, and reporting. A partner therefore needs to understand the business processes behind the SAP configuration.

Consider a manufacturing company, for example. An S/4HANA transformation may involve:

• production planning;
• bills of material and routings;
• procurement;
• supplier schedules;
• quality management;
• warehouse operations;
• plant maintenance;
• manufacturing execution;
• logistics;
• customer delivery requirements.

The same migration strategy may look very different for a retailer, pharmaceutical company, energy provider, or financial services organisation.

For UK businesses, relevant experience may include:

• UK finance and tax processes;
• manufacturing;
• retail;
• logistics;
• supply chain;
• automotive;
• aerospace and defence;
• pharmaceuticals and life sciences;
• energy;
• regulated industries.

Industry knowledge does not mean that the partner needs to have worked with an identical company. More importantly, it should understand the processes and regulatory or operational constraints that shape your business.

When evaluating references, therefore, look for similarity of complexity, not just similarity of industry.

4. Evaluate Data Migration Capability

Data migration is one of the areas most likely to create problems later in an S/4HANA programme if it is not addressed early.

The source system may contain years of customer, supplier, material, financial, and transactional data. Some of it may be duplicated, incomplete, outdated, or structured differently from the target S/4HANA environment.

A migration partner should have a clear approach to:

• master data;
• transactional data;
• historical data;
• open items;
• financial balances;
• organisational structures;
• customer and supplier records;
• Business Partners;
• material data;
• asset data;
• data cleansing;
• transformation and mapping;
• validation;
• reconciliation;
• archiving.

Do not limit the discussion to whether the partner can technically move the data.

A more useful question is:

Which data actually needs to move, what should be transformed or archived, and how will you prove that the result is accurate?

Data migration should normally be tested through multiple migration cycles rather than being treated as a one-off activity near the end of the programme.

Ask About Migration Tools and Accelerators

Specialised tools can make some migration activities faster and more repeatable. They may help with data profiling, cleansing, mapping, transformation, validation, and reconciliation.

When speaking with potential partners, ask:

• What tools do you use for data assessment?
• Which migration activities are automated?
• How do you track data quality?
• How many mock migration cycles are normally performed?
• How is reconciliation handled?
• Can you demonstrate the tooling on a realistic data scenario?

The tools themselves should not be the deciding factor. A good migration tool cannot compensate for a weak data strategy or poor ownership of data quality.

5. Assess SAP Integration Expertise

An S/4HANA environment is usually part of a much larger technology landscape.

Depending on the organisation, this may include:

• MES;
• PLM;
• WMS and SAP EWM;
• SAP TM;
• CRM;
• e-commerce platforms;
• banking systems;
• tax applications;
• supplier platforms;
• logistics providers;
• data warehouses;
• analytics platforms;
• cloud applications;
• warehouse automation;
• production-control systems.

A migration can change APIs, interfaces, data structures, business processes, and integration technologies. That means integration work needs to start early.

Ask the partner to create an inventory of the current integrations and identify:

• what each interface does;
• which business process depends on it;
• what technology it uses;
• who owns it;
• how errors are monitored;
• what security requirements apply;
• whether it needs to change in S/4HANA.

The review should result in clear decisions about which integrations will be retained, redesigned, replaced, consolidated, or retired.

Leaving integration until the later stages of the project can create serious problems during testing and cutover.

6. Check Clean Core and Custom-Code Expertise

An S/4HANA transformation is a good opportunity to review custom SAP development.

Many organisations have accumulated custom ABAP, reports, interfaces, enhancements, forms, workflows, and bespoke applications over many years. Some are still essential. Others exist because the standard SAP functionality was not suitable at the time they were created.

The partner should help classify these developments according to both technical and business value.

For each custom development, consider whether it should be:

Retained → Remediated → Replaced → Redesigned as an Extension → Retired

The assessment should cover areas such as:

• custom ABAP;
• modifications;
• enhancements;
• user exits;
• custom transactions;
• reports;
• interfaces;
• workflows;
• forms;
• bespoke applications.

Clean Core principles are particularly relevant here. The objective is not simply to make existing custom code compatible with S/4HANA. It is to decide where standard SAP functionality should be used and where extensions are genuinely justified.

Ask the partner how it approaches custom-code assessment and what target architecture it recommends for extensions.

7. Evaluate the UK Delivery Model

For UK organisations, it is important to understand how the implementation team will actually work with the business.

The entire delivery team does not have to be based in the UK. A combination of UK-based consultants and nearshore or offshore resources can work well, particularly for larger programmes.

However, the responsibilities should be clear.

Ask:

• Who will lead the programme?
• Who will work directly with UK business stakeholders?
• Where will the key project resources be based?
• Which activities will be delivered offshore or nearshore?
• How will time-zone differences be handled?
• How will escalation work?
• Who will be available during cutover?
• What support will be available after go-live?

The main issue is not whether a partner has a large UK office. It is whether the delivery model gives the business access to the right expertise when it is needed.

8. Find Out Who Will Actually Deliver the Project

The team introduced during the sales process may not always be the team that delivers the implementation.

This is worth clarifying before signing a contract.

Ask for the proposed project organisation and identify the people responsible for the major workstreams.

This should include:

• programme management;
• solution architecture;
• SAP functional design;
• technical architecture;
• data migration;
• integration;
• testing;
• change management;
• cutover;
• hypercare.

It is also worth asking which roles are:

• named;
• fully allocated;
• shared with other projects;
• subcontracted;
• offshore;
• nearshore.

Pay particular attention to senior roles. Find out how involved the programme director, solution architect, and other senior specialists will be once the project moves beyond the sales and planning stages.

You are not just buying a methodology. You are hiring a team to make important decisions throughout the transformation.

9. Compare Commercial Models Carefully

SAP migration proposals can be difficult to compare because providers may structure scope and pricing differently.

A lower headline price does not necessarily mean a lower project cost.

When comparing proposals, look at the full scope, including:

• discovery and assessment;
• solution architecture;
• SAP configuration;
• development;
• data migration;
• integration;
• testing;
• change management;
• training;
• cutover;
• hypercare;
• project management;
• travel;
• third-party solutions;
• post-go-live support.

Exclusions deserve particular attention.

For example, a proposal may exclude certain integration work, data cleansing, testing activities, or change management. These items can later appear as additional costs or change requests.

What Should an SAP Migration Proposal Clearly Define?

At minimum, the proposal should clearly state:

• project scope;
• deliverables;
• assumptions;
• dependencies;
• milestones;
• responsibilities;
• resource model;
• delivery locations;
• pricing structure;
• change-control process;
• third-party costs;
• testing responsibilities;
• cutover scope;
• hypercare arrangements;
• post-go-live support.

For a large SAP programme, understanding what is not included can be just as important as understanding what is included.

10. Assess Post-Go-Live Support

Go-live is not the end of an S/4HANA transformation.

The first weeks and months after deployment can bring production issues, integration problems, data corrections, performance questions, and requests from users who are getting used to the new processes.

The partner should be able to explain how it will support the organisation during this period.

Depending on the programme, this may include:

• hypercare;
• application support;
• SAP technical support;
• functional support;
• integration monitoring;
• performance optimisation;
• security support;
• release management;
• S/4HANA enhancements;
• continuous improvement.

It is also worth discussing support during the implementation rather than waiting until the end. The way the solution is designed, documented, tested, and handed over will affect how easy it is to operate after go-live.

A good post-go-live model should therefore be part of the original transformation plan, not an afterthought.

SAP Migration Partner vs. SAP Consultant vs. System Integrator

The terms SAP migration partner, SAP implementation partner, SAP consultant, and SAP system integrator are often used interchangeably, but they can describe different levels of expertise and responsibility.

An SAP consultant typically provides specialist knowledge in a particular SAP solution, business process, or technical area.

An SAP implementation partner focuses on designing and deploying the target SAP environment, including configuration, integration, testing, and go-live activities.

An SAP system integrator brings together SAP and non-SAP systems and may have the scale to deliver complex, multi-country transformation programmes.

An SAP migration partner focuses specifically on the transition to S/4HANA, including assessment of the existing landscape, migration strategy, data, custom code, integrations, testing, and cutover.

For a broader S/4HANA transformation, organisations may need a partner capable of combining all of these capabilities:

Strategy → Assessment → Business Transformation → Architecture → Data → Integration → SAP Implementation → Testing → Cutover → Continuous Improvement

The key question is therefore not which title a provider uses, but whether it can take responsibility for the parts of the transformation your organisation actually needs.

For complex UK S/4HANA programmes, end-to-end capability can be particularly valuable when the transformation involves multiple entities, legacy systems, significant customisation, complex integrations, or substantial business process change.

How Much Does an SAP S/4HANA Migration Partner Cost in the UK?

There is no fixed price for an SAP S/4HANA transformation. Partner fees vary significantly depending on the size and complexity of the programme, the starting ERP landscape, migration approach, delivery model, and level of support required.

For UK organisations, a rough planning range can be useful:

Indicative ranges only. Actual costs depend on scope, landscape complexity, delivery model, and project duration.

The main factors influencing SAP partner fees include:

• Starting landscape: SAP ECC, another ERP, or multiple legacy systems;
• Migration approach: Greenfield, Brownfield, or Selective Data Transition;
• Functional scope: Finance, procurement, manufacturing, supply chain, sales, and other Lines of Business;
• Data complexity: Volume, quality, historical data, cleansing, transformation, and reconciliation requirements;
• Integration landscape: Number and complexity of SAP and non-SAP interfaces;
• Customisation: Assessment, remediation, replacement, or redevelopment of existing custom code;
• Geographic scope: Number of countries, legal entities, localisations, and deployment sites;
• Delivery model: UK-based, nearshore, offshore, or blended teams;
• Testing and cutover: Number of migration cycles, testing phases, mock cutovers, and hypercare requirements;
• Post-go-live services: Application management, optimisation, monitoring, and ongoing SAP support.

A useful way to think about the total programme cost is:

Assessment + Design + Build + Data + Integration + Testing + Change + Cutover + Hypercare + Ongoing Support

The partner's day rate is only one part of the calculation. A lower rate can result in a higher total cost if the programme requires more effort, has weak governance, or generates additional change requests.

UK organisations should therefore compare total cost of ownership and total delivery scope, not simply the headline implementation fee.

What Should Be Included in an SAP Migration Partner Proposal?

Before comparing prices, make sure each provider has clearly defined:

• scope and deliverables;
• assumptions and dependencies;
• resource model and locations;
• data migration responsibilities;
• integration scope;
• testing and cutover responsibilities;
• change management;
• hypercare period;
• exclusions and change-request rules;
• post-go-live support.

This makes proposals easier to compare and reduces the risk of selecting a low initial estimate that later expands through additional services and change requests.

For a more accurate estimate, organisations should complete a SAP S/4HANA readiness and scoping assessment before requesting a final implementation proposal.

SAP Migration Partner Evaluation Checklist

Use the following framework when comparing potential providers:

This helps move the selection process from “Which consultancy looks most impressive?” to “Which partner presents the lowest delivery risk for our specific transformation?”

How to Compare SAP Migration Partners

When several providers appear qualified, use a structured scoring model.

For example:

The exact weighting should reflect the organisation's priorities.

For a manufacturing business, integration and industry expertise may deserve greater weight. For a highly customised ECC environment, data and custom-code capabilities may be more important.

The goal is to establish a transparent selection process that can be defended internally.

How to Build an SAP S/4HANA Migration RFP

A well-structured RFP helps organisations compare providers on the same basis.

An SAP migration RFP should typically include:

1. Company and Business Context

Describe:

• business structure;
• countries;
• sites;
• key processes;
• strategic objectives.

2. Current SAP Landscape

Document:

• SAP releases;
• modules;
• custom developments;
• integrations;
• databases;
• third-party applications;
• infrastructure.

3. Migration Scope

Define what is expected to change and what must remain.

4. Target Architecture

Where known, describe the preferred deployment model and architectural objectives.

5. Data Requirements

Specify:

• master data;
• historical data;
• open transactions;
• data quality;
• retention;
• reconciliation requirements.

6. Integration Requirements

List major internal and external systems and expected integration responsibilities.

7. Testing and Cutover

Ask providers to explain how they will manage:

• functional testing;
• integration testing;
• performance testing;
• user acceptance testing;
• cutover;
• rollback planning;
• hypercare.

8. Project Team

Require providers to identify key roles and responsibilities.

9. Commercial Response

Request a consistent pricing structure so proposals can be compared fairly.

10. References

Ask for customers with comparable:

• SAP landscape;
• industry;
• size;
• migration approach;
• geographic complexity.

A strong RFP should make it difficult for providers to hide important assumptions behind a low headline price.

10 Red Flags When Choosing an SAP S/4HANA Transformation Partner

Not every warning sign is obvious during the selection process. Some appear as overly confident promises, vague assumptions, or a lack of detail around the areas that typically drive SAP transformation complexity.

“We can migrate you in six months.”

A fixed timeline without a detailed assessment of the current landscape, scope, data, integrations, and business readiness is a red flag. A credible partner should explain what the timeline is based on and which assumptions could change it.

“The migration is mostly technical.”

An S/4HANA transformation can affect business processes, data, integrations, reporting, roles, controls, and the wider operating model. A partner focused only on the technical migration may overlook important business dependencies.

“Your custom code can simply be carried over.”

Existing custom developments should be assessed for business value, technical compatibility, and long-term maintainability. The goal should be to retain what matters, replace what does not, and reduce unnecessary technical debt.

“We will assess integrations later.”

Integrations should be inventoried and assessed early. Delaying this work can expose hidden dependencies, increase testing effort, and create avoidable cutover risks.

“Data migration is straightforward.”

Data quality often becomes one of the biggest sources of project effort. A credible partner should explain how it will handle profiling, cleansing, transformation, validation, reconciliation, and historical data.

“Our offshore team will handle most of the project.”

A distributed delivery model can be effective and cost-efficient. The red flag is not offshore delivery itself, but unclear accountability, weak UK stakeholder engagement, or limited access to senior expertise.

“The senior architect will join when needed.”

Senior architecture should be involved throughout the programme, not only during pre-sales or at major decision points. Ask who will actually make architectural decisions and how much time they are committed to the project.

“The estimate is based on similar projects.”

No two SAP landscapes are identical. A useful estimate should reflect your users, entities, processes, customisations, integrations, data, and transformation objectives.

“Anything outside this scope will be a change request.”

Change control is normal, but an excessive number of exclusions can indicate that the initial proposal does not reflect the full programme scope. Review assumptions, dependencies, and exclusions carefully before comparing prices.

“Go-live is the end of the project.”

Go-live is the beginning of the new operating model. The partner should have a clear plan for cutover, hypercare, incident management, user support, performance, and transition to ongoing SAP services.

A Simple Rule for Evaluating Red Flags

The strongest SAP transformation partners should be able to explain what they know, what they do not yet know, what assumptions they are making, and how they will reduce uncertainty before committing to cost or timelines.

Confidence is useful. Evidence, transparency, and a clear methodology are more important.

Questions to Ask an SAP Migration Partner

Before selecting a provider, ask:

1. Which SAP S/4HANA migrations have you delivered that are comparable to ours?
2. What migration approach would you recommend and why?
3. What assumptions are you making about our current SAP landscape?
4. How will you assess custom code?
5. How will you approach data migration and reconciliation?
6. How will you assess our integrations?
7. Which migration accelerators or tools do you use?
8. How will Clean Core principles be applied?
9. Who will be our solution architect?
10. Who will actually deliver the project?
11. What work will be delivered from the UK, offshore or nearshore?
12. How will you manage business change?
13. What is included in the proposed price?
14. What is explicitly excluded?
15. What happens if the programme encounters unexpected complexity?
16. How will testing be structured?
17. What is your cutover methodology?
18. How long is hypercare?
19. What support model do you recommend after go-live?
20. Can we speak to customers with similar SAP environments?

The quality of the answers is often more revealing than the presentation itself.

SAP Migration Partner Selection for UK Manufacturers

Manufacturing organisations should place particular emphasis on operational integration.

The SAP landscape may connect:

Engineering → Planning → Procurement → Production → Quality → Warehouse → Logistics → Finance

A migration partner needs to understand the dependencies between these processes.

For example, changing material master data can affect procurement, production, inventory, warehouse operations, quality processes and financial postings.

Testing should therefore extend beyond SAP application screens and cover real end-to-end scenarios.

Relevant experience may include:

• discrete manufacturing;
• process manufacturing;
• automotive;
• aerospace;
• industrial manufacturing;
• engineering;
• supply chain;
• warehouse operations.

SAP Migration and the UK Regulatory Environment

A migration partner should also understand the organisation's regulatory and data requirements.

Depending on the business, this can include:

• UK tax and finance requirements;
• UK GDPR;
• data protection;
• audit requirements;
• cybersecurity;
• industry-specific regulation;
• segregation of duties;
• financial controls.

The partner should clearly define responsibilities between the customer, SAP, cloud provider, implementation team, and other third parties.

SAP S/4HANA Migration Tools and Accelerators

SAP S/4HANA transformation programmes involve large volumes of data assessment, preparation, validation, and testing. The right tools and accelerators can reduce repetitive work, improve data quality, and give project teams greater visibility across migration cycles.

When evaluating an SAP transformation partner, ask which tools and reusable assets it can bring to the programme. Relevant capabilities may include:

• data profiling and cleansing;
• mapping and transformation;
• validation and reconciliation;
• migration monitoring;
• custom-code assessment;
• automated testing;
• integration monitoring.

For example, the LeverX Data Management Platform supports data management activities across SAP transformation programmes, helping teams standardise migration processes, automate repetitive tasks, and improve control over data quality.

The important question is not whether a partner has a proprietary platform. It is whether its tools solve a real problem in your transformation and deliver measurable improvements in speed, quality, control, or visibility.

Ask potential partners to demonstrate their migration tools using scenarios that are relevant to your own SAP landscape, rather than relying on a generic product demo.

SAP Migration Strategy Should Start Before the Implementation

A common mistake is to select an implementation partner before understanding the current landscape. A better approach is to establish the transformation requirements first and then select a partner that matches them.

The typical sequence is:

Assess → Define → Select → Design → Build → Migrate → Test → Cut Over → Stabilise

Assess

Establish the baseline across the SAP landscape, business processes, data, integrations, custom code, and technical debt.

Define

Set the target operating model, business objectives, transformation scope, and success criteria.

Select

Evaluate SAP transformation partners against relevant experience, technical capabilities, delivery model, tooling, and commercial terms.

Design

Define the target architecture, processes, data strategy, integrations, and Clean Core approach.

Build

Configure S/4HANA and develop the required integrations, extensions, and supporting capabilities.

Migrate

Prepare, transform, validate, and reconcile data through controlled migration cycles.

Test

Validate end-to-end business processes, integrations, data, security, performance, and business readiness.

Cut Over

Execute the final migration and transition through a controlled cutover and business continuity plan.

Stabilise

Provide hypercare, resolve production issues, optimise processes, and transition to the long-term operating model.

The key principle is simple: do not choose a partner before you understand the transformation you are asking them to deliver. A clear assessment and scope create a stronger basis for comparing providers, estimating cost, and reducing delivery risk.

Two Recommendations from LeverX

Recommendation 1: Do Not Choose a Migration Approach Before Assessing the Landscape

Terms such as Greenfield, Brownfield, and Selective Data Transition are useful, but they should not determine the strategy before the current environment is understood.

Start by assessing:

• what works today;
• what needs to change;
• which data and processes should be retained;
• which integrations are business-critical;
• which customisations still create value;
• where technical debt exists;
• what the future operating model should look like.

Only then should the organisation select the most appropriate transformation approach.

Recommendation 2: Evaluate the Partner's Ability to Reduce Complexity

A strong SAP S/4HANA partner should not simply move existing complexity into the new environment. It should help the organisation simplify processes, improve data quality, rationalise integrations, reduce unnecessary customisation, and establish a sustainable target architecture.

During the selection process, ask prospective providers:

“What will you help us eliminate, simplify, or standardise as part of the transformation?”

The strongest answers should go beyond migration execution and address process simplification, data management, integration rationalisation, Clean Core, automation, and long-term maintainability.

Why the Big Four Are Not Always the Best Choice

The Big Four can bring substantial resources, broad consulting capabilities, and experience with large-scale SAP transformation programmes. For global and highly complex organisations, this scale can be valuable.

However, scale can also create a different dynamic between the client and the service provider.

Large consulting firms typically work with a broad ecosystem of technology vendors, implementation partners, and strategic alliances. For a major transformation, this can mean that the client is one of many relationships managed across a large organisation.

There is also a practical consideration around balance and independence. When a provider is significantly larger than the customer, the relationship can become more hierarchical. Decisions may involve multiple organisational layers, account structures, and commercial priorities, making it harder for the client to maintain direct access to senior decision-makers or challenge recommendations openly.

A specialist SAP partner can offer a different model:

• A more direct client-partner relationship with fewer organisational layers;
• Greater senior-level involvement throughout the programme;
• Clearer accountability for recommendations and delivery outcomes;
• More flexibility in adapting the delivery model as requirements change;
• Deeper specialisation in the specific SAP technologies and processes in scope.

The point is not that the Big Four are the wrong choice. Their scale can be exactly what some organisations need.

The question is whether the relationship is structured around the customer's transformation objectives or the provider's broader account ecosystem.

Before selecting a partner, ask:

“Will we have direct access to the people making the key decisions, and will our interests remain aligned throughout the transformation?”

For many UK organisations, the best SAP partner is not necessarily the largest provider. It is the one that can combine the required scale and expertise with direct accountability, independent advice, and a genuinely balanced client relationship.

How LeverX Supports SAP S/4HANA Migration

SAP S/4HANA transformation requires more than technical migration. Organisations need to make the right decisions about strategy, data, architecture, integrations, customisation, testing, and the future operating model.

LeverX supports the transformation journey end to end, from initial assessment and strategy through implementation, migration, cutover, and ongoing optimisation.

Our capabilities include:

• SAP S/4HANA transformation strategy and readiness assessment
• Greenfield, Brownfield, and Selective Data Transition
• Data migration and management
• Integration and SAP BTP architecture
• Clean Core and custom-code assessment
• Business process transformation
• Testing and cutover
• Hypercare and SAP Application Management Services

LeverX also brings proprietary technology and reusable accelerators to selected transformation scenarios, including the LeverX Data Management Platform, which helps organisations automate and control key data management activities across the transformation lifecycle.

Our approach is focused on one objective: helping UK organisations move to a more maintainable, integrated, and scalable SAP environment without simply carrying legacy complexity into the future.

What Should the Right SAP Migration Partner Look Like?

The right SAP S/4HANA migration partner should be able to demonstrate more than SAP credentials or a long list of projects. For a successful migration, look for five core qualities.

Relevant Migration Experience

The partner has delivered SAP S/4HANA migrations comparable to yours, including similar source systems, data volumes, business complexity, and geographical scope.

Data and Technical Expertise

It can demonstrate strong capabilities in data migration, custom-code assessment, integrations, system conversion, testing, and cutover.

Clear Migration Methodology

The partner has a structured approach to assessment, migration planning, data preparation, validation, testing, cutover, and hypercare, rather than relying on a standard timeline for every project.

Delivery Accountability

It can clearly explain who will deliver the migration, how risks and dependencies will be managed, and who will remain accountable throughout the programme.

Tools and Accelerators

The partner can demonstrate migration tools, automation, and reusable assets that can reduce manual effort, improve data quality, and make migration cycles more predictable.

Ultimately, the best migration partner is not necessarily the largest consultancy or the lowest-cost provider.

It is the partner that can demonstrate the right combination of migration expertise, technical capability, tooling, and delivery accountability for your specific SAP S/4HANA migration.

Frequently Asked Questions

How do I choose an SAP S/4HANA migration partner?

Start by assessing the provider's comparable S/4HANA migration experience, methodology, data and integration capabilities, industry expertise, delivery model, project team, commercial transparency, and post-go-live support.

What should I look for in an SAP migration partner in the UK?

Look for relevant S/4HANA experience, UK delivery capability, strong data and integration expertise, industry knowledge, transparent commercial terms, and a clearly defined project team.

What is the difference between greenfield and brownfield SAP migration?

A greenfield implementation creates a new S/4HANA environment and redesigns processes. A brownfield system conversion preserves more of the existing SAP environment while transitioning it to S/4HANA. Selective transition provides another option for organisations that need to selectively retain or transform parts of the existing landscape.

How much does SAP S/4HANA migration cost?

There is no standard price. Cost depends on the SAP landscape, migration approach, data, customisation, integrations, countries, users, testing, change management and target architecture.

How long does SAP S/4HANA migration take?

There is no universal timeline. A simple environment can differ significantly from a multinational SAP landscape with extensive custom code, integrations, data volumes and manufacturing operations. A credible timeline should follow an initial assessment.

Should I choose an SAP partner based on price?

Price should be one factor, not the primary selection criterion. Compare the complete scope, assumptions, delivery team, exclusions, methodology and expected total cost of ownership.

What should an SAP migration RFP include?

An SAP migration RFP should cover the current SAP landscape, business processes, migration scope, target architecture, data, integrations, testing, cutover, project team, commercial requirements, support and customer references.

Why is data migration important in an SAP transformation?

Data migration affects master data, transactional information, balances, open items, historical information and business processes. Poor data quality or incomplete reconciliation can create operational problems after go-live.

Should an SAP migration partner have proprietary tools?

Not necessarily, but proven accelerators can improve efficiency and control in areas such as data management, testing, assessment and migration. Organisations should evaluate the actual value of the tools rather than selecting a provider simply because it owns proprietary technology.

Can a migration partner support us after S/4HANA go-live?

Many SAP partners offer hypercare and ongoing application management. This should be explicitly defined in the contract, including scope, service levels, escalation and responsibilities.

Conclusion

Choosing an SAP S/4HANA migration partner in the UK is ultimately a risk-management decision.

The right provider should be able to connect strategy with execution:

Current SAP landscape → Migration strategy → Target architecture → Data → Integration → Business transformation → Go-live → Continuous improvement

Do not select a partner solely because it has SAP certifications, a large consultant pool, or an attractive initial price.

Instead, evaluate whether the provider can:

• demonstrate relevant S/4HANA migration experience;
• recommend the right transition approach;
• manage complex data migration;
• rationalise integrations;
• apply Clean Core principles;
• understand your industry;
• provide an effective UK delivery model;
• provide the actual team that will deliver the programme;
• offer transparent commercial terms;
• support the organisation after go-live.

For UK organisations preparing for an SAP ECC-to-S/4HANA transformation, a structured partner-selection process can significantly reduce delivery risk and improve the chances of achieving measurable business value from the programme.

Planning an SAP S/4HANA migration in the UK? Talk to LeverX about your current SAP landscape, migration options, data strategy, and target architecture.

Disclaimer: SAP S/4HANA migration timelines, costs, approaches, and outcomes vary depending on the source system, data volumes and quality, customisations, integrations, business scope, and target architecture. Any examples or estimates provided in this article are for general informational purposes only and should not be considered a fixed quotation or guarantee of project results. A detailed assessment of the existing SAP landscape is recommended before defining a migration strategy or implementation plan.