Solution : https://service.sap.com/sap/support/notes/530828 (SAP Service marketplace login required)
Key words :
warning message v1099 reason, issue warning messages, attached advance correction, information message, subsequent documents, purchase order, quantity change, sales order, subsequent document, quantity correlation
Related Notes :
481464 | Incorrect correlation/processing after V4 message II |
359714 | Warning messages from the quantity check |
359265 | Incorrect correlation/processing after V4 message |