seems begin=true (for a nested conversation) is required b/c the @Begin 
annotated getPopulateUsers() method is being called twice (after users triggers 
the processValueChange() method via a drop-down box.

"Now if you tried to go to this page again while still on a page in a 
long-running conversation, Seam would return to you an error like the one in 
Listing 6-8, stating that you cannot create a new conversation while in an 
existing conversation."

--Nusairat book, pg. 170.

So the exception should occur on the 2nd method call to that same @Begin 
method...

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