Solution : https://service.sap.com/sap/support/notes/1082360 (SAP Service marketplace login required)
Key words : 
support pack sapk-60011ineccdimp, ecc-dimp 600for customers, lower support pack level, industry solution ecc dimp, industry solution etm, order account determination, attached document 'fv45pf0k_kontenfindung, enhancement implementation 139 j3gs_sapfv45p, enhancement implementation, account assignment
Related Notes : 
       
| 1000686 | Order account assignment incorrect w/ CO account assignment | 
| 922557 | Changing, creating or replacing enhancements |