Solution : https://service.sap.com/sap/support/notes/536382 (SAP Service marketplace login required)
Key words : 
abap workbench -> ddic objects -> development -> dictionary, attached source code corrections, source code corrections, 'parameter process' tab, 'parameter check' tab, newly generated subitem, symptom backorder processing, source code, ddic change, ddic changego
Related Notes : 
       
| 375193 | Backorder processing: Composite SAP note on posting |