Solution : https://service.sap.com/sap/support/notes/378745 (SAP Service marketplace login required)
Key words : 
additional key words transaction, rule-based atp, source code repairs, /sapapo/bop_updatebackorder processing, /sapapo/bop_result, backorder processing, oltp system, problem occurs, parameter process, results display
Related Notes : 
       
| 378378 | Backorder processing: Remaining requirements incomplete | 
| 375193 | Backorder processing: Composite SAP note on posting |