Solution : https://service.sap.com/sap/support/notes/567291 (SAP Service marketplace login required)
Key words : 
source code corrections attached, /sapapo/atp_sd_order_get function module, /sapapo/qt_index_get_detail function module, 'item_ not_found' exception condition, affects product allocation assignment, current backorder processing run, interactive backorder processing terminates, 'object_not_found' exception condition, product allocation assignment, /sapapo/atp_bop 112 message
Related Notes : 
       
| 570056 | Confirmed quantity of the main item is not updated | 
| 569954 | |
| 558485 | |
| 555657 | |
| 542492 | |
| 450674 | Processing the date and time in the time series |