I encountered this error when i add an Outgoing Payment from an approval procedure with 2 or more invoices with withholding tax set as upon payment.
what could be the possible reason why i can't add the outgoing payment.
when i try adding the outgoing payment directly without going through Approval Procedure the document is successfully added.
My version of SAP is 8.8 PL09. This was already tested on the latest patch PL12.