| contract release order (SRM-ESO) |
A form of purchase order used by a customer to request from the vendor 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 including "call-off" (UK), "draw-off" (UK), "delivery order," "release," and "blanket release."