Solution : https://service.sap.com/sap/support/notes/115350 (SAP Service marketplace login required)
Key words :
purchase order scheduling dialog box, additional key words vbap-fixmg, set indicator 'fixed date, sales order item, fixed quantity indicator, attached advance correction, availability control screen, rv03v-fixmg, vbap-matnr, availability screen
Related Notes :
359171 | Button missing on PO scheduling screen |