Recent years show new strategy of SAP to encourage customers to run their implementations of S/4HANA in a different way than in the past. A term “Clean Core” has been introduced as a promise to ease up many challenges known from SAP ECC and SAP CRM. This article tries to explain what it actually mean, repercussions it may have and gives an idea how to cope with it.
Understanding the Clean Core Concept
The Clean Core principle is a set of rules, dos and don’ts while building a solution within S/4HANA. Main rule is to use only certain supported extensibility techniques, that are not disrupting the Core Business Engine, which include:
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In-App Extensibility – for business users to adapt UIs, add custom fields, or define simple logic using key user tools
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Developer Extensibility – for building more advanced enhancements
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Side-by-Side Extensibility – for decoupled custom applications and services built on SAP Business Technology Platform (BTP)
SAP promises, that following those principles gives a long list of benefits.
Key Benefits of Clean Core Approach
Keeping the Core clean gives several advantages:
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Simplified Upgrade:
Clean Core extensions are not touching and modifing the SAP Standard, they are built in a safe way, that does not affect the Core Business functionality of Service processes. It means less effort while testing after a system upgrade and smaller risk of encountering unexpected issues.
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Innovation Readiness:
Not changing the Core, provides the flexibility to adopt new features and enhancements listed on the SAP Roadmap —without the need to adjust or rebuild existing custom developments. This ensures continuous access to innovation while maintaining system stability.
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Cloud Compatibility:
Clean Core is essential for aligning S/4HANA Service with SAP’s cloud strategy. It leaves the door open for future transition into SAP Public Cloud.
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Reduced Total Cost of Ownership (TCO)
Simple access to new features, lower effort during upgrades, less maintenance during the operations reduce the costs.
Common Challenges
Clean Core approach promises important advantages but it leads to challenges as well. One of the biggest chellange is that almost all known ways of extending the process are not valid anymore. This means that some business requirements cannot be implemented in a time-efficient way compared to the classical way. This usually means combination of:
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rethinking and redesigning the Business Process withing a Company to closer fit to SAP-Standard
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leaving the Clean Core aside for some parts of the requirement
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building a faster solution but accepting the unfriendliness of User Experience that may result in lower productivity.
Another point is a knowledge gap within the consultants, they lack expertise in modern frameworks like RAP or Tools like SAP BTP. If we add up a timeline pressure in a project, it is crucial to be well prepared for surprises that will come up.
Practical Examples of Challenging Requirements
Below described sample requirements in S/4HANA Service would be implemented in a completely different way following Clean Core, compared to the classical extensibility, where it was solved with reasonable resources:
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Data model extension – Adding new Table with data to a Service Order and integrating it in the “Manage Service Orders” Fiori Application
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UI behavior – Changing the logic how the UI reacts on the user input in the “Edit Business Solution Quotation” Fiori Application
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Process change – Changing the Data of a Service Document while saving it
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Process automation – Creation of a follow-up transaction when setting the User Status to “Released”
Defining a Clean Core Strategy for S/4HANA Service
Navigating through an implementation where Clean Core is a goal requires a structured approach and strategic actions, like:
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Establish Clear Development Standards:
Make sure that the Clean Core extensibility techniques are to be selected as the first only possibly the only way of fulfilling business requirements
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Build the right Skill Set
It is crucial that people who work on a task understand the extensibility framework and know the tools like RAP, CDS Views, SAP BTP
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Be prepared for process redesign:
Well known business process, although complex, may works perfectly fine in today’s system but it might be challenging to move it 1:1: to a new system. The more cost efficient way might be simply redesigning a process,
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Be consequent in executing the strategy:
At first it may seem to be too much hustle to go through for a small business logic change however during the project you will see the pattern and you will be able to reuse some components built at the beginning of the journey hence saving resources with next similar requirements
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Think out of the box:
New technology where a solution is built in a modern way do not have a sample or a pattern to be taken as an inspiration. Creativity is a key to success
Conclusion
Clean Core is not about forbidding the customization and enhancing the system, on contrary, it is a green light to do so, but only while keeping in mind certain set of rules to follow. In the context of S/4HANA Service, where functional complexity often encourages to extensive enhancements, it is worth to consider this approach. In return, the service operations will be future-proof, open for improvements coming from SAP standard functionality, stable, reliable. At 4cx, we assist clients throughout S/4HANA Service implementation journey in achieving these goals.
Ready to Take the Next Step?
If you’re planning a Clean Core journey in S/4HANA Service or need guidance on sustainable extensibility, we’re here to help. Contact us at 4cx to discuss how we can support your transformation — without compromising your core.
