SAP Message AP304 - Partner function not specified as unique.

Diagnosis
You selected a characteristic for the partner function, but you did notenter a defined partner function. When you select this characteristic,you must always enter a specific partner function that was defined inCustomizing.

System Response
The report is not executed.

Procedure
Check your entries and the report definition.
You should also note: the characteristic for the partner function canonly be used along with the characteristic for the partner.