Solution : https://service.sap.com/sap/support/notes/664711 (SAP Service marketplace login required)
Key words : 
imported support package sapkh47014, system issues message sg105, enter rate & / & rate type &, exchange rate type, field vbrk-kurst, function module convert_to_local_currency, system settings, billing document, terms vf01, accounting_head_line reason
Related Notes : 
       
| 833388 | Error handling in the SD/FI interface | 
| 674967 | Message VF050 when releasing billing document | 
| 642526 |