Yes, it should be #{branchHome.instance}. Thanks a lot for the help. And now invoking #{categoryHome.loadCategoriesByBranchId(branchHome.instance.id)} method works fine :) But I still don't understand why I should use a:region and a:outputPanel. I don't use any of them and the second selectOneMenu is refreshed without a problem after the loadCategoriesByBranchId(branchHome.instance.id) method is invoked. Could you explain the aim of using that components in detail, please? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4086696#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...