About Message End Events
A message end event ends a track in a process and throws a message. Message end events have inputs but no outputs.
If you drag a message end event onto an abstract, service, user, or rule task activity, or onto a call activity, it is added to the activity as a non-interrupting message boundary intermediate event.
Software AG Designer extends BPMN functionality to support the use of EDA event types and the EDA protocol in BPMN Message Events.
Note: When creating a callable process that is to be called by a call activity step, always implement a send task in the callable process to return to the parent process. Message end events and message intermediate events will only publish a document and will not return it to the parent.