There are multiple definitions - click on the translation that matches your context.

Abruf

Substantiv

partial

release order

Comparative law notes

a "release order" is a purchase order that enjoys a discount because it is associated with a contract. After a contract is approved and users have access to create releases against it, then they create standard requisitions for items, goods, or services. Once approved, the orders are considered release orders: In other words, these are purchase orders that have the benefit of an associated contract.