Solution : https://service.sap.com/sap/support/notes/520718 (SAP Service marketplace login required)
Key words : 
title             program lcavef09 type, title             program lcavef11 type, title program     lcavef12 type, title program     lcavef11 type, 007message short text, include program status, live save application, apo backorder processing, sales order item, message class cavemessage
Related Notes : 
       
| 532993 | BOP: Updating despite interim delivery | 
| 532885 | BOP: Program termination in 'TIMESTAMP_DELIVERY' routine | 
| 529018 | BOP: Intermediate change of the document | 
| 519194 | Incorrect assignment of subitems to main items | 
| 375193 | Backorder processing: Composite SAP note on posting |