Entity type &1: Duplicate data record &2 cannot be written
Message type: E = Error
Message class: USMD1 - Datenmodel
Message number: 187
Message text: Entity type &1: Duplicate data record &2 cannot be written
What causes this issue?
The system passed data of entity type &V1& to the data buffer in order
to write this data. This data contains two data records that have
identical keys, but different values. The leading characters of one of
these data records are &V2&.
System Response
The system has not transferred data to the data buffer.
How to fix this error?
Correct your entries (if applicable) or notify SAP.
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.