Solution : https://service.sap.com/sap/support/notes/427709 (SAP Service marketplace login required)
Key words :
subsequent milestone billing, additional key words, vbap-kzvbr = 'e', attached advance correction, account assignment occurs, sales order receives, account assignment, sales order, originating sales, -order production
Related Notes :
182183 | Problem w. down payment clear.w.ref. to quotation |