The purpose of the ChangeShipmentUnit is to enable an application to provide a ShipmentUnit information from another business application module in order for that module to perform the task at hand..

The ChangeShipmentUnit is typically published from the business application that is is requesting that the master or owner of the ShipmentUnit information to Change the contained update. This may also occur across enterprises.

The respons to the ChangeShipmentUnit is the AcknowledgeShipmentUnit to indicate success or failure. If the receiving system needs to make changes to the ShipmentUnit then the ChangeShipmentUnit can be used a coresponding RespondShipmentUnit accepts the changes or indicates additional changes.