SAP Message C$596 - Enter a valid source; &1 is invalid

Diagnosis You cannot use the source &V1& you entered because it is not assigned tothe specification category &V2& in Customizing. Procedure Choose a valid source. If you want to use the source &V1&, notify yoursystem administrator. Procedure for System Administration Assign the specification category &V2& to the source &V1& inCustomizing.