Human Task and worklistapp

Hi.
SOA Suite 10.1.3.1.0
If I create a blank BPEL process and add a human task (only modifications to the default settings is title and adding one assignee as username) the approval (or any outcome selection) of the task from the worklist application sometimes succeeds, but most of the time it fails.
guess it has to be some kind of timeout issue... ?!
any suggestions on this matter?
tqx
it actually says:
An error occured while processing your request.
An exception occurred during transaction completion: ; nested exception is: javax.transaction.RollbackException: Timed out.
If you need more information, please check with your administrator with the following exception-identifier: "2007/10/12_07:48:02:921_wshake"
Message was edited by:
user598353

did you create the bpel as asynchronous?

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