The purpose of the CancelAcknowledgeShipmentUnit is to enable an application to respond to a ShipmentUnit information from another business application module in order to accept or reject the request to Process.

The CancelAcknowledgeShipmentUnit is typically published from the business application that is is receiving the request to Process the ShipmentUnit information This may also occur across enterprises.

The CancelAcknowledgeShipmentUnit is the response for the ProcessShipmentUnit 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.