The clean-core strategy is a SAP initiative to keep the core of SAP S/4HANA as clean as possible by moving customizations and extensions to the side-by-side layer. This allows SAP to more easily deliver new releases of S/4HANA without having to worry about breaking custom code.
There are two main ways to extend SAP S/4HANA:
Developer Extensibility: This allows developers to extend the core of SAP S/4HANA by modifying the source code. This is not allowed under the clean-core strategy.
Side-by-Side Extensibility: This allows developers to extend SAP S/4HANA by creating new applications that run alongside the core system. These applications can communicate with the core system using public APIs.
The following are the benefits of using Side-by-Side Extensibility:
Flexibility: Side-by-Side Extensibility allows developers to extend SAP S/4HANA in any way they see fit.
Scalability: Side-by-Side Extensibility can be scaled to meet the needs of any organization.
Maintainability: Side-by-Side Extensibility is easier to maintain than Developer Extensibility, because custom code is not embedded in the core system.
Therefore, the best way to implement the clean-core strategy is to use Side-by-Side Extensibility. This will allow you to extend SAP S/4HANA in a flexible, scalable, and maintainable way.