Solution : https://service.sap.com/sap/support/notes/594671 (SAP Service marketplace login required)
Key words : 
'sales'  development class    'cave'  upper/lower case     'x', terms cave_sl_doc_inbound_bop/sapapo/bop_permit_fixedfixmg, filter variant setting, connected oltp systems, 'include programm'  application, applied thefollowing notes, 'include lcavef16'  type, program source code, source code corrections, source code
Related Notes : 
       
| 623466 | |
| 593775 | BOP: Incorrect results for 'Add remaining requirements' | 
| 587226 | |
| 558261 | |
| 504192 | |
| 375193 | Backorder processing: Composite SAP note on posting |