For many enterprises, SAP systems are an essential part of the backbone of their corporate IT infrastructure. Critical business information is stored within ERP systems, and the golden source for employee data might still be the SAP HR system. Business processes are implemented through portal solutions relying on SAP infrastructure, data is held in SAP HANA, the migration to S/4HANA is ongoing, and highly individualized functionality is coded right into the existing standard SAP modules by using ABAP or Java.