Clean Core

Definition

Clean Core is the modern prevailing SAP architectural philosophy strictly prohibiting the invasive, modification-heavy customization of the core ERP software to guarantee immediate, frictionless software version upgrades specifically within cloud-deployed SAP S/4HANA setups.

Business Purpose and Architecture

Legacy SAP ECC utility systems were notoriously riddled with aggressive hardcoded user-exit modifications, making an upgrade practically impossible. Architecturally, S/4HANA mandates Clean Core. To accomplish incredibly specific business behaviors without damaging the upgrade path, developers must completely strip out customized module modifications targeting standard Level B exits. Instead, they must strictly transition logic towards highly supported Level A architectural equivalents (like Kernel-based BAdIs) protecting the company’s long-term technical health.