One more thing in this topic: I created base class for my TestTransactionRequest (TestTransactionRequest inherits from it but doesn't add any functionality) and changed my external bean method arguments. This new class is not a seam component, and if i rewrite data from TestTransactionRequest to my new class and pass it to external ejb - everything works ok, even after redeployment. So I suppose, that problem is somewhere in seam components. But I can't find it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4056688#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...