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Have you tried using jbpm page flows for navigation instead of the pages.xml?
From Dan Allen's Seam in Action book (VERY worth a read if u can spare the coin to buy):
\"If, during a page flow, users attempt to return to an earlier page and resubmit the
form, Seam will gracefully redirect them to the current page—the <page> node where
the process token is positioned. The same goes for when users click the refresh button
and the browser attempts to resubmit the form. Of course, the refresh problem has
already been solved by performing a redirect during the transition, but it’s still nice to
know that Seam prevents the double submit anyway.\"
Personally, have yet to implement the page flow.. but apparently it handles it well