Solution : https://service.sap.com/sap/support/notes/383689 (SAP Service marketplace login required)
Key words : 
~ftp/specific/isoil/46b/notes/note, -mine-specific note, usingthe statistics log, additional key words, important supplementary information, hpm oil materials, oil quantity conversion, open deliverycredit values, credit management takes, -oil credit management
Related Notes : 
       
| 406058 | IS-OIL / IS-MINE: CRTs 25-27 for SAP_APPL Support Packages | 
| 312430 | |
| 150132 | IS-OIL: credit management: value update problem | 
| 124571 | Incorrect credit values S066 S067 FD32 | 
| 47531 | IS-OIL / IS-MINE / IS-CWM correction guideline |