Flagging Purchase Requisition Items as "Closed" 
An item of a purchase requisition is only regarded as Closed if the requested order quantity has been included in a purchase order.
You can also set an item to Closed manually. This item will then not be taken into account by the materials planning and control system.
You can set the Closed indicator at the following points (it can later be cancelled if necessary):

You can still create purchase orders by referencing a requisition if this indicator has been set in the requisition concerned.