Solution : https://service.sap.com/sap/support/notes/525612 (SAP Service marketplace login required)
Key words :
activate/deactivate individual user exits, 6c 31add user exit 'exit_saplmr1m_004', correct withholding tax posting, changing withholding tax data, insert export parameter 'e_change', tab page 'amount split', user exit 'exit_saplmr1m_004', export parameter 'e_change', withholding tax amounts, 'exit_saplmr1m_004'-> change-> tab
Related Notes :
| 574671 | MIRO: Term of payment for amount split |
| 459425 | MR1M: User exit for changing withholding tax data |