Solution : https://service.sap.com/sap/support/notes/1442742 (SAP Service marketplace login required)
Key words :
system issues message ff 707, net tax base, net discount base, correct tax amounts, correct document, transaction miro, terms ff707, xmwsn reason, company code, t001-xmwsn
Related Notes :
1249265 | FF711 in BAPI with several documents and jurisdiction codes |