Solution : https://service.sap.com/sap/support/notes/1447027 (SAP Service marketplace login required)
Key words :
cross-company code accounting document, company code clearing account, document line items, credit-side character, external tax system, external system, debit-side, terms bapi_acc_document_post, buv reason, implemented note 1241247
Related Notes :
1525005 | Create missing entries in ETXDC* tables |
1524351 | Corrections supporting note 1525005 |
1241247 | BAPI does not update External Tax System |