Solution : https://service.sap.com/sap/support/notes/492771 (SAP Service marketplace login required)
Key words :
temporary quantity assignments reason, backorder processing performs badly, '/sapapo/om_delta_getupd_pg_vpl' function module, persistent quantity assignments, call transaction se24, transaction identifier return, call transaction se37, <leave blank>optional, product allocation checks, abap source code
Related Notes :
| 609435 | Composite SAP note: Performance in backorder processing |
| 420598 | Composite SAP Note for GATP performance in APO 3.1 |