Solution : https://service.sap.com/sap/support/notes/1377279 (SAP Service marketplace login required)
Key words :
-line tax calculation, ttxd-xtxit = 'x', field txgrp properly, xtxit reason, values properly, bseg-txgrp, terms txgrp, transaction mir7, company code, jurisdiction code
Related Notes :
| 647424 | Redetermining field TXGRP in BSET and BSEG |