Solution : https://service.sap.com/sap/support/notes/167962 (SAP Service marketplace login required)
Key words :
additional key words vbfa, affected returns document numbers, indirect flow records, execute program sdvbfa01, indirect document flow, sales order refer, document flow, sales order, create returns, billing document
Related Notes :
184563 | Doc flow deleting returns w. ref. to billing doc |