Solution : https://service.sap.com/sap/support/notes/582843 (SAP Service marketplace login required)
Key words : 
automatically schedule back, terms production order, automatically reset, manufacturing order, process order, question remains, cor reason, longer confirmed, partially confirmed, operation dates
Related Notes : 
       
| 582847 | |
| 582840 | Resetting dates after canceling a confirmation in APO | 
| 581347 | |
| 501432 | BADI for the reconciliation of CIF data and APO data | 
| 492772 | Date transfer in confirmed operations not wanted |