01 Oct The role of customization in SAP S/4HANA: what really changes

From flexibility to sustainability: rethinking customization in the S/4HANA era

Anyone who has worked for years with SAP ECC knows this well: customizations have often been the key to adapting the system to business processes.

Over time, however, many implementations have turned into a jungle—developments that are hard to maintain, incomplete documentation, and upgrades that are nearly impossible without major intervention.

Now, with the arrival of SAP S/4HANA, something is changing—and not just technically.

S/4HANA doesn’t say “no” to customization. It organizes it.
One of the most common misconceptions is that SAP S/4HANA “no longer allows customization.”

The truth is that S/4HANA encourages a rethink of the very concept of customization, promoting a more sustainable and scalable approach.

In the new environment, customizations:

• must follow SAP best practices
• are managed with more advanced tools (e.g., In-App Extensibility and Side-by-Side Extension)
• are better isolated from the core, so they don’t compromise future updates

In other words, you can still adapt the system to your needs—but in a more structured, organized, and future-compatible way.

How the approach to customization changes
With SAP S/4HANA, the paradigm shifts:
no longer “I customize everything I need,” but “I adapt only where it truly makes sense, without compromising system stability.”

In S/4HANA, the real question is not “Can I customize?” but “Is it worth it?”

Every customization should deliver real value, be properly documented, and remain maintainable over time.
Most importantly, it should start with an analysis of real business processes—understanding what truly needs to be adapted and what can align with standard solutions.

During SAP S/4HANA migration projects, this is one of the areas we analyze most carefully: which customizations to keep, which to eliminate, and which to redesign using new tools.

It’s not about “removing everything,” but about simplifying where possible and building extensions that are truly useful, sustainable, and upgrade-friendly.

In addition, we help internal teams understand how to manage customizations in the new environment—so they don’t fall back into outdated approaches.

Want to understand how to manage your customizations during the move to S/4HANA?
At Innorg, we can help you gain clarity with a practical assessment and a tailored plan.