[Users] BPEL engine: No matching activity were found for given message null

[leofl [via Petals Forums]]

"No matching activity were found for given message null"

Hi, I have received this message from the BPEL engine at the Petals log some
times... I wasn't able to grasp a pattern responsible for the problem.

The message appears just after a process invocation and the client side
stays waiting for an answer that never comes.

Is there a simple meaning to this message occurrence? 

Thank you
Leonardo Leite
IME - USP

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