Solution : https://service.sap.com/sap/support/notes/514199 (SAP Service marketplace login required)
Key words :
/sapapo/atpq_chkusg product allocation assignment check, goto/text elements/selection texts, order receipt quantity existed, product allocation assignment, terms product allocation, order receipt quantity, sfaemeng selection field, /sapapo/rmquot_usage_check reason, /sapapo/rmquot_usage_check program, select 'change' select
Related Notes :
676128 | Product allocations: Product allocation assignment check |
575958 | Composite SAP note: Avoiding data inconsistencies in APO |