Solution : https://service.sap.com/sap/support/notes/593775 (SAP Service marketplace login required)
Key words : 
terms cave_sl_doc_inbound_bop/sapapo/bopearly confirmationopen quantity reason, 'add remaining requirements' check, apo backorder processing, confirmed schedule line, confirmed quantity, results display, delivery date, program error, solution implement, program correction
Related Notes : 
       
| 594671 | BOP: Incorrect update for fixed deadline and quantity | 
| 375193 | Backorder processing: Composite SAP note on posting |