A Message Event will generate objects following the receipt of a message to the following process. Message Events can cause objects waiting at a process to continue through the model or prompt the pool to generate objects at events.
Message Event simulation properties
Sent/Received Message
Select the message flow that you want to convey.
Match Received Messages/Matched Joined Objects
You can select what type of match you want the received messages to be: By ID, By Objects or By Attribute.