How To Fix USMD1018 - Data model &1, entity type &2, relationship &3: Data element specified

SAP Error Message - Details

• Message type: E = Error

• Message class: USMD1 - Datenmodel

• Message number: 018

• Message text: Data model &1, entity type &2, relationship &3: Data element specified

What causes this issue?

A data element cannot be specified for relationships with <LS>Leading</>
or <LS>Qualifying</> as the relationship type. The system always uses
the data element assigned to the referenced entity type. The field name
in the internal data structures also corresponds to the field name of
the referenced entity type.

System Response

The data model cannot be saved or activated.

How to fix this error?

Delete the settings for the data element or change the relationship
type.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.