S/4HANA
What it is
SAP's current-generation ERP suite, built on HANA, delivered on-premise or as S/4HANA Cloud (private/public edition). The 'digital core' that Clean Core keeps clean.
Why it matters for Clean Core
S/4HANA is the target the whole curriculum points at: simplified data model, Fiori-first UX, and a managed-update cadence that depends on a clean core to be painless.
Common pitfall
Assuming an ECC custom-code base 'just works' on S/4HANA. The simplified data model (e.g. the material/finance changes) and removed/unreleased objects mean real remediation — both functional and cloud-readiness.