Solution : https://service.sap.com/sap/support/notes/510549 (SAP Service marketplace login required)
Key words :
apo customizing -> global availability check -> product availability check -> maintain atp group, product availability check, -party order processing reason, /sapapo/bopopen quantity, backorder processing, -party subitems, open quantity, previously executed, terms transaction, prerequisites due
Related Notes :
| 375193 | Backorder processing: Composite SAP note on posting |