Solution : https://service.sap.com/sap/support/notes/617197 (SAP Service marketplace login required)
Key words :
customizable message 7q338 'withholding tax information, extended withholding tax, payment request reason, withholding tax, payment request, transaction fba7, transaction fba6, system issues, terms fb05, program error
Related Notes :
733609 | Payment-relevant posting key and withholding tax |
609711 | FB01: Withholding tax for payment |
442588 | No withholding tax information in the documnt after clearing |