Solution : https://service.sap.com/sap/support/notes/375847 (SAP Service marketplace login required)
Key words : 
source codethe include /sapapo/latp_updatef0c, enter function group /sapapo/atp_update, additional key words transaction, flag 'remote-enabled module', enter /sapapo/dm_atp_update_bopnoupd, enter /sapapo/atp_bop, call transaction se37, call transaction se91, temporary quantity loads, 066 item _1/_2
Related Notes : 
       
| 375193 | Backorder processing: Composite SAP note on posting | 
| 350180 | Backorder processing: check time stamps |