SAP Message UCR0004 - Reference characteristic &1 is ambiguous

Diagnosis
You have specified more than one value for reference characteristicV1 in the global filter or within a row/column/cell of the report ofthe query. However, a unique value is required.

System Response
Processing is terminated.

Procedure
Always specify reference characteristic &V1& in a unique way in theglobal filter or within a row/column/cell of the query.