Solution : https://service.sap.com/sap/support/notes/162504 (SAP Service marketplace login required)
Key words :
requested schedule line exists, additional key words, attached advance correction, existing confirmed quantity, requested schedule line, schedule line, requested quantity, direct procurement, purchase requisition, program error
Related Notes :
389635 | Scheduling problem for several schedule lines |
359171 | Button missing on PO scheduling screen |
181998 | Deletion of item with static assembly terminates |