Solution : https://service.sap.com/sap/support/notes/399220 (SAP Service marketplace login required)
Key words :
attached source code corrections, additional key words wtmg, 'document conversion'conversion step, 'document conversion' conversion step, fields with_item-wt_qbshha, extended withholding tax, transaction wtmg, withholding tax, table with_item, with_item-hkont
Related Notes :
| 504442 | WTMG: red traffic light in 'Convert documents' zero amount |
| 390148 | WTMG: Composite note for withholding tax changeover |