Sandesha2 question?

How does Exactly-once option of WSRM works?

I am using the ping sample from sandesha2
where it sends 3 messages and the 3rd is set to be last!
after it gets the 3rd one it terminates the sequence and everything is ok!

But if i remove the last message property or 
before i send the last one i terminate the program!

I have the following situation the server gets first and second message,
execute the action for each one, without waiting for the last message!

I want to execute all or nothing!
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