The difference between the gross requirement plan and net requirement plan?

Gross requirements plan is a schedule that shows the total demand for an item (prior to subtraction of on-hand inventory and scheduled receipts) and (1) when it must be ordered from suppliers, or (2) when production must be started to meet its demand by a particular date. Net requirements plan includes gross requirements, on-hand inventory, net requirements, planned order receipt, and planned order release for each item.