A message intermediate event can be used to both send and receive messages. When used to “catch” the message, the event marker must be left empty. If the process was waiting for a message, this causes it to continue, or it changes the flow for exception handling.

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[1]     Silver, B. (2009). BPMN Method and Style: A levels-based methodology for BPM process modeling and improvement using BPMN 2.0. In CodyCassidy Press US.