Solution : https://service.sap.com/sap/support/notes/569483 (SAP Service marketplace login required)
Key words : 
6c sapkh46c35temporary afrp3 records, unnessary afrp3 records, future change records, generated records remain, process control key, actual costs online, actual costs, process order, service type, work center
Related Notes : 
       
| 542590 | Confirmation with actual costs: Double CO documents | 
| 536666 | Confirmation with actual costs: Duplicate CO docs possible |