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

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