Solution : https://service.sap.com/sap/support/notes/1730413 (SAP Service marketplace login required)
Key words :
software component sap_appl sap application, manual pre/post-implementation steps, user exit exit_saplfytx_user_001 -> include zxfytu03, check icount = i_tax_item_input-pos_no, memory id import tbkpf, evaluate items directly posted, specfic bseg item> endloop, import field i_tax_item_input-pos_no, import parameter i_tax_item_input-pos_no, tax account takes place
Related Notes :
1790294 | Error F5060 if gl-items with NVV tax and others without tax |
1692637 | Document with a gap in BSET-TXGRP because of 0 amount items |