Solution : https://service.sap.com/sap/support/notes/306523 (SAP Service marketplace login required)
Key words : 
additional key words co15, create incorrect costs, generate incorrect costs, order header confirmations, order header confirmation, transaction co15, incorrect costs, errors occurred, cost analysis, transaction cofc
Related Notes : 
       
| 420307 | TSG: missing actual costs with confirmation | 
| 155282 | CO docs for confirmations: Correction programs |