I tried the following scenario:

Page /object_details.xhtml is designed to show details of my particular object.
I tuned pages.xml to map request parameters (such as objejctId) to properties 
of my SFSB backing the page. And my custom page action was marked as @Begin.
I realized that in spite whether I'm using AJAX (IceFaces in my case) or not, 
Seam call that action method every time. So at the second attempt, when Seam 
tries to invoke action that is binded on a button on the page, it invokes 
@Begin method again and suggest annotating with @Begin(nested=true). That's a 
problem of Seam design - it provides us with myriads of possibilities, that are 
not working in combination some times :)

In my case I succeeded with introducing a fake page that does nothing but 
accepting parameters and invoking page action. Page action method returns 
reference to another page. It helped me to omit reentering into new 
conversation.
In other words you need to address your conversational page through the fake 
page, that does all preparation work for you.

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