Solution : https://service.sap.com/sap/support/notes/932627 (SAP Service marketplace login required)
Key words :
enter incoming invoice, tax exchange rate, tax rate reason, standard sap system, transaction miro, purchase order, rbkpv-txkrs, entered manually, note updates, support package
Related Notes :
| 1007549 | MIRO: Error M8 285 due to different tax exchange rate |
| 909956 | MIRO: Incorrect tax rate |