Solution : https://service.sap.com/sap/support/notes/386082 (SAP Service marketplace login required)
Key words : 
system generates message im468 'notification &, additional key words iw31, respective entry existing, create notification, temporary notification, initial screen, program error, order types, order header, object list
Related Notes : 
       
| 397174 | Notification reference deleted in the order header | 
| 387746 | Termination during order confirmation |