Solution : https://service.sap.com/sap/support/notes/535816 (SAP Service marketplace login required)
Key words : 
pdc confirmationcats confirmation, terms production order, correction removes note 533384, cn27mass confirmation, maintenance order, process order, collective order, actual costs, afrc record, mass processing
Related Notes : 
       
| 533384 | Confirmation with actual costs: Duplicate CO documents poss | 
| 155282 | CO docs for confirmations: Correction programs |