Solution : https://service.sap.com/sap/support/notes/377271 (SAP Service marketplace login required)
Key words :
additional key words bypass, revenue/expense items, transaction ftxp deactivate, error message ff804, separate tax account, -deductible input taxes, tax bypass, error message, tax account, deductible taxes
Related Notes :
395703 | MIRO, MR1M: Composite SAP note Taxes in invoice verification |