Solution : https://service.sap.com/sap/support/notes/78089 (SAP Service marketplace login required)
Key words : 
additional key words joint venture, prerequisites incorrect conversion, decimals defined, vice versa, currency amounts, note assumes, calculation, notes 72032, corrections
Related Notes : 
       
| 81654 | Non-Op billing calculates wrong value | 
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| 47531 | IS-OIL / IS-MINE / IS-CWM correction guideline |