Multiple Container calls to same bean - HELP!

Here's something that I can't understand.
In short:
When I make a request to a Session Bean for a particular method, it's starts the method, calls other beans, finishes the method, and then the same method is called 3 more times.
In short
servlet ---> Big session bean
----> child bean 1
----> child bean 2
----> child bean 3
----> child bean 4
<---- should return to the servlet but calls the big session bean again 3 times.
the method is declared as Required and any Exceptions thrown by the children are caught by Big Session, so I don't see how the Container is calling multiple times.
Any ideas or possible starting points would be greatly appreciating.
Thanks in advance,
Craig

I have figured out what happened.
A Transaction rollback was being thrown, which I thought was the result of the lengthy time to process the four calls. The transaction time out is defaulted at 60 secs (half way through the method call) and after that it rolls back. The default for the max-tx-reties is 3, which is seen.
Therefore, with the max-tx-retries="0" in the orion-ejb-jar.xml and the <transaction-config timeout="150000"/> set to 5 minutes my transaction has time to finish.
Thanks, for your help.
Craig

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