SAP Message 9P013 - Linking not possible; export invoices already linked for this period

Diagnosis
You want to link zero-rated outgoing invoices to the incoming invoiceswhose input VAT (or a part thereof) was assigned to the 0% operationtype during VAT separation. This is, however, not possible because theprogram for linking zero-rated outgoing invoices has already been runand there is data stored in the database.

Procedure
To delete the linking entries in the database, choose ClearProcessed Invoices on the output screen.
Note: You can only delete these entries if the Secondary Eventsprogram (J3RFUM26) has not been used to transfer tax in the currentquarter.