Solution : https://service.sap.com/sap/support/notes/493568 (SAP Service marketplace login required)
Key words :
attached source code corrections, changed sales order items, oltp sales document, connected oltp system, oltp system, backorder processing, terms transactions, /sapapo/bop, /sapapo/bop_update, /sapapo/bopiupdate
Related Notes :
497590 | Backorder processing: update status not set |
375193 | Backorder processing: Composite SAP note on posting |