Solution : https://service.sap.com/sap/support/notes/442303 (SAP Service marketplace login required)
Key words : 
~ftp/specific/isoil/40b/notes/note, ~ftp/specific/isoil/46b/notes/note, ~ftp/specific/isoil/46c/notes/note, incorrect updateof billing due list, billing index due list update, sales order type customizing, blank billing type proposed, billing index due list, -mine-specific note, differential invoice billing type
Related Notes : 
       
| 387861 | Order of IS-OIL / IS-MINE 4.6C Notes (SAP_APPL) | 
| 312435 | Order of IS-OIL / IS-MINE 4.6B Notes (SAP_ABA) | 
| 312430 | |
| 312371 | Order of IS-OIL / IS-MINE 4.6B Notes (SAP_BASIS) | 
| 145854 | Order of IS-OIL notes 4.0b on basis R/3 4.0B (LCP) | 
| 145850 | Order of IS-OIL notes 4.0b on basis R/3 4.0B (SP) | 
| 47531 | IS-OIL / IS-MINE / IS-CWM correction guideline |