Solution : https://service.sap.com/sap/support/notes/611844 (SAP Service marketplace login required)
Key words : 
manually entered withholding tax data, derived withholding tax data, withholding tax data, extended withholding tax, withholding tax information, logistics invoice verification, account-based follow-, withholding tax, derived correctly, fi follow-
Related Notes : 
       
| 529970 | MIR7 MIR4 Incorrect withholding tax data in amount split |