Migrating to SAP S/4HANA: What you need to know before making a decision

For years, many companies have viewed migration to SAP S/4HANA as a project that could wait. As long as SAP ECC continued to work and operations ran smoothly, it was difficult to justify a transformation of this scale. But that conversation is changing. The evolution of the SAP ecosystem and new business requirements have turned migration into a decision that can no longer be considered solely from an IT perspective.

The question should not simply be when to migrate. There is a more important one: what do we want to achieve with SAP S/4HANA that our current environment no longer allows us to do with sufficient agility?

Answering this question changes the perspective of the entire project. Migration is not simply about replacing one technology with another. It means deciding what is worth retaining, what should be simplified and how SAP should support the business over the coming years.

Migration starts long before SAP S/4HANA is implemented

An SAP environment that has been running for years reflects, to a large extent, the history of the company. Each custom development was created to address a particular need, and many customisations were introduced to solve problems that the standard system could not address at the time.

The result can be a fully operational system that is increasingly difficult to evolve. Processes that depend on Excel, external reports, complex interfaces or developments whose original purpose has been lost over time. SAP ECC continues to work, but introducing changes requires increasing effort.

This is where a migration to SAP S/4HANA should really begin: with a critical review of the existing environment.

The question is not simply what we can take from ECC, but what actually makes sense to retain. Automatically transferring configurations, data and custom developments may appear to be the least risky option, but it can also bring years of accumulated complexity into the new system.

This is particularly relevant for industrial companies, where SAP connects production, procurement, maintenance, quality, warehousing, logistics and finance. Understanding how the organisation actually operates, rather than simply how the ERP is configured, is essential before making technological decisions.

SAP S/4HANA opens up new possibilities, but technology alone cannot solve a poorly designed process. The platform provides the capabilities; the company must decide how to use them.

Before deciding How to migrate, decide what you want to transform

When a company begins considering its migration, the discussion often moves quickly towards Greenfield, Brownfield or selective migration. These are important decisions, but another question should come first: how far do we want to transform the business?

An organisation with established processes and a well-maintained SAP environment may find Brownfield a logical route for moving forward while retaining much of its existing configuration. By contrast, a company with extensive customisation, outdated processes or a highly complex architecture may gain more value from a Greenfield approach. Between these two scenarios, selective migration makes it possible to retain what continues to deliver value while transforming specific areas.

There is no universally superior strategy. There is a strategy that is better suited to each business reality.

This is why the initial assessment is so important. Processes, data, developments and integrations should be analysed alongside business objectives. Improving planning, increasing inventory visibility, simplifying ERP maintenance or better integrating production and logistics are business reasons to migrate. Doing so simply because there is a date on SAP's calendar is a technological reason.

It is also important to consider how the system will evolve. The Clean Core approach aims to keep S/4HANA as close to standard as possible and reduce unnecessary customisations. This does not mean giving up what differentiates a company. It means identifying where customisation creates genuine value and where it simply adds complexity.

Go-Live should not be the measure of success

Going live is an important milestone, but the real value of a migration only becomes apparent afterwards. Success should be measured in business terms: whether planning has improved, information is more reliable, manual tasks have been reduced and changes can be introduced more easily.

This perspective becomes even more important as the SAP ecosystem continues to evolve. Business AI, Joule, automation, advanced analytics and SAP BTP are expanding the possibilities around S/4HANA. However, introducing new technologies on top of inefficient processes or unreliable data simply digitises existing problems.

Perhaps the most important decision before migrating, therefore, is not choosing a tool or setting a date. It is defining what kind of company we want to have after the project.

For some organisations, the priority will be simplification. For others, it will be better integration between plants, improving the supply chain or creating an architecture capable of supporting future growth. What matters is defining that objective before the project begins.

At HAZI Business Solutions, we approach migration from this perspective. Before deciding how to move to SAP S/4HANA, we help organisations understand where they are starting from, what is worth retaining and what should be transformed. Because a successful migration is not simply one that gets a company to S/4HANA. It is one that leaves the business better prepared for what comes next.