SAP Message USMD1083 - Data model &1, entity type &2: Invalid relationship with entity type &3

Diagnosis Entity types with storage and use type 4 can be used as To-entity types in relationships only if therelationship has the type Leading and the To-entity typealso has the storage and use type 4. One or more of theseconditions have not been fulfilled. System Response The data model cannot be saved or activated.