I have one postback to this issue. I have exactly what founded in edit.xhtml in seam example booking: <ui:composition xmlns="http://www.w3.org/1999/xhtml" | xmlns:ui="http://java.sun.com/jsf/facelets" | xmlns:h="http://java.sun.com/jsf/html" | xmlns:f="http://java.sun.com/jsf/core" | xmlns:s="http://jboss.com/products/seam/taglib"> | | <div class="entry"> | <span class="label"> | <ui:insert name="label"/> | </span> | <span class="input"> | <ui:insert/> | </span> | </div> | | </ui:composition> And this cause the problem java.lang.IllegalStateException: duplicate Id for a component. You have to put name in 'span class="input"' and define it in your xhtml source, wich solves the problem. Here the piece of my code: | <ui:composition xmlns="http://www.w3.org/1999/xhtml" | xmlns:ui="http://java.sun.com/jsf/facelets" | xmlns:h="http://java.sun.com/jsf/html" | xmlns:f="http://java.sun.com/jsf/core" | xmlns:s="http://jboss.com/products/seam/taglib"> | | <div id="entradaDeErro" class="entry"> | <s:label id="labelDeErro" styleClass="label #{invalid?'errors':''}"> | <ui:insert id="labelDeErro" name="label"/> | <s:span id="requeridoErro" styleClass="required" rendered="#{required}"> *</s:span> | </s:label> | <span id="spanDeErro" class="input #{invalid?'errors':''}"> | <s:validateAll> | <ui:insert id="componente" name="conteudo"/> | </s:validateAll> | </span> | <s:message id="mensagensErro" styleClass="error errors"/> | </div> | | </ui:composition> | I hope this help you. Regards, Valtoni View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4120885#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...