What should be the normal behavior when calling a retired/stopped process?

Dear all,
I thought that when one of my asynchronous BPEL process would call another asynchronous BPEL process that is retired or stopped(with no other version number active), I would receive any kind of error. So I tried it, and instead of receiving an error, the first BPEL process sent his message and received the ack without any errors (that is in both cases, retired or stopped). So I checked if the message was put in the thread queue or any other kind of queue and no it wasn't. I tried to reactivate the second process, and nothing happened. So I guess the message had been lost. Is this the normal behavior??
Since we are implementing asynchronous processes to do a "fire and forget" type of system, we would have liked to receive some kind of error so we know that no instance had been instanciated and that the message had not really been delivered?
Can anyone tell me where I'm wrong. Is there a chapter talking about that in any document. If anyone has read about that I'd like to know where so I can understand the way it works!
Thank you!

Thanks for your prompt reply,
I'm sorry but I'm not sure I understand the onError callback thing,
If we consider my called asynchronous process was a one-way process (no callbacks),
Correct me if I'm wrong but:
-This means I would have to define a callback in the called process (that onError callback).
-Then, I gotta put a receive or a pick activity, which means I need to wait for an error answer, which is not wanted.
-And, would a retired or stopped process really answer me and throw me an error?!?! I'm not sure since its stopped... So i would probably wait forever I guess.
I'm just trying to find a way to make sure the message has been taken in charge by the next process and if not, to be alerted!
Thanks for helping a beginner like me!
Btw I've read that post:
Re: How to throw a Fault from an asynchronous process to another process
It helps understanding the fault handling in asynch processes, but my problem is more about the fact that my async process is stopped/retired!

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Revision: 21050
Revision: 21050
Author:   [email protected]
Date:     2011-04-09 16:22:58 -0700 (Sat, 09 Apr 2011)
Log Message:
Popup: The default behavior when an Event.CLOSE is dispatched through the popup component should be preventable
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Popup: The write-only behaviors property can not be used with states
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