Solution : https://service.sap.com/sap/support/notes/519549 (SAP Service marketplace login required)
Key words : 
transportation planning/vehicle scheduling, /sapapo/bop reason, goods issue date, material availability date, loading date, delivery date, current date, order items, terms transaction, problem occurs
Related Notes : 
       
| 375193 | Backorder processing: Composite SAP note on posting |