https://userapps.support.sap.com/sap/support/knowledge/en/3745641
3745641 - GRCPINW and GRCPERP software components on SAP S/4HANA Foundation | SAP Knowledge Base...
During Maintenance Planner stack generation, GRCPIERP V1200_S4 is not visible/selectable while GRCPINW V1200_750 is visible. No error messages are shown.