SAP Message USMD1018 - Data model &1, entity type &2, relationship &3: Data element specified

Diagnosis
A data element cannot be specified for relationships with Leadingor Qualifying as the relationship type. The system always usesthe data element assigned to the referenced entity type. The field namein the internal data structures also corresponds to the field name ofthe referenced entity type.

System Response
The data model cannot be saved or activated.

Procedure
Delete the settings for the data element or change the relationshiptype.