Method for issuing (reducing on-hand quantities) materials to a manufacturing order. With backflushing, the material is issued automatically when production is posted against an operation. The backflushing program will use the quantity completed to calculate through the bill of material the quantities of the components used, and reduce on-hand balances by this amount. There are usually options during the backflush process to report scrap. In operations using backflushing it is advisable to set up specific machine locations and have materials transferred from storage locations to machine locations when they are physically picked for production. The backflush operation will then issue the material from the machine locations.