Solution : https://service.sap.com/sap/support/notes/571687 (SAP Service marketplace login required)
Key words : 
prerequisites note 437983 solution implement, external tax system, debit/credit indicator, billing document, accounting document, terms etxdci, vf01 reason, attached corrections, transferred, inconsistencies
Related Notes : 
       
| 600400 | IS-M/SD: FI transfer with tax rounding differences | 
| 584089 | IS-M/SD: FI posting with tax rounding differences | 
| 437983 | No FI transfer in case of tax rounding differences |