SAP Message USMD2090 - Change request type &1: 'Optional' is set for entity type &2

Diagnosis In change request type &V1&, the Optional indicator was set forentity type &V2&. However, this is only allowed for entity types withthe key assignment Key Cannot BeChanged; No Internal Key Assignment. Entity type &V2& has a differentkey assignment. Procedure Ensure that the Optional indicator is not set in change requesttype &V1& for entity type &V2&.