Within MRP, open manufacturing orders and open purchase orders are considered as “scheduled receipts” on their due date and will be treated as part of available inventory during the netting process for the time period in question. Scheduled receipt dates and/or quantities are not normally altered automatically by the computer. Further, scheduled receipts are not exploded into requirements for components as MRP logic assumes that all components required for the manufacture of the item in question have either been allocated or issued to the shop floor.