A release order is issued against a distributed contract in a local system. When this happens, a release order IDoc belonging to message category BLAREL is passed on to the ALE layer and transmitted. At the same time, the local release order documentation is updated.

Message category BLAREL (IDoc type BLAREL02) is used to transmit data such as the quantity released, the release date, the releasing logical system, and the PO number to the central system.

The local system automatically sends the release order IDoc back to the central system, since the ID of the sending logical system is stored in the contract header when a distributed contract is created.