Solution : https://service.sap.com/sap/support/notes/416762 (SAP Service marketplace login required)
Key words : 
additional key words transaction, transport planning/vehicle scheduling, goods receiving hours, selected transport routes, goods issue date, /sapapo/bop_updatebackorder processing, material availability date, backorder processing, availability check, transport scheduling
Related Notes : 
       
| 419232 | Backorder processing: TP/VS confirmation is not updated | 
| 418581 | Backorder processing: Update changes desired del. date | 
| 418443 | Backorder proc.: TP/VS delivery date before desired date | 
| 417525 | Backorder processing: Delivery scheduling in TP/VS | 
| 408885 | Backorder processing: TP/VS scheduling ignored | 
| 402505 | Backorder processing: Loading date not taken into account | 
| 399301 | Backorder processing: Loading date not taken into account | 
| 396408 | Backorder processing: Error for scheduling | 
| 375193 | Backorder processing: Composite SAP note on posting |