SAP Message UPS095 - .. &1, '&2 (&3)' : Error during processing (status &4)

Diagnosis
An error occurred as the IDoc for the object type &V2& with key &V3&and validity &V4& was being posted.

System Response
The system could not post the object.

Procedure
Check the application log (TCode SLG1) for the failed IDoc.
If necessary check the object IDoc.