| contract release order |
Form of purchase order used by a customer to request from the vendor, as and when required, part of the total quantity or value of goods or services stipulated in a longer-term purchase contract.
A release order contains information on quantities and delivery dates.
A number of different terms exist for this concept in the literature and in practice (including: "call-off" (UK), "draw-off" (UK), "delivery order", "release" and "blanket release").