Solution : https://service.sap.com/sap/support/notes/1387805 (SAP Service marketplace login required)
Key words :
bset tax items, bseg tax items, field bseg-txgrp, ttxd-xtxit = 'x', activated document splitting, tax-relevant, fi document, terms txgrp, xtxit reason, account lines
Related Notes :
| 1639384 | FS 210 because several TAXPS = 000000, but others 000999 |
| 1422415 | FI-SL document splitting: Timeout in SAPLGLT0 |
| 1314818 | BSEG-tax line items not summarized |
| 1070206 | BSEG summarization missing because of TAXPS |
| 1009374 | NewGL: Prevent split of taxes if calculated line-by-line |
| 643273 | FB01: Summarization BSET with "Determine taxes line-by-line" |