Solution : https://service.sap.com/sap/support/notes/744382 (SAP Service marketplace login required)
Key words : 
attached program correction, convert planned orders, message category reason, batch input mode, planned order conversion, planned order, batch input, message type, message c2 242, report ppbico40
Related Notes : 
       
| 453755 | No status check when converting plnd order to productn order |