if you are re-rendering from inside the loop (like you are) then you shouldn't need to do anything:<ui:repeat var="dayTime" value="#{planWorkBean.dayTimes}"> | <h:selectOneMenu value="#{dayTime.workShift}"> | <s:selectItems value="#{workShifts}" var="workShift" label="#{workShift.name}" noSelectionLabel="-" /> | <s:convertEntity /> | <a4j:support action="#{dayTime.setWorkShift(workShift)}" event="onchange" reRender="dayTimePanel" /> | <h:selectOneMenu> | | <a4j:outputPanel id="dayTimePanel"> | <h:outputText value="#{dayTime.workShift.totalTime}" converter="HourMinuteConverter" /> | </a4j:outputPanel> | </ui:repeat>Note that the id is 'dayTimePanel'. When JSF renders this it will assign incrementing IDs (something like j_xx:1:dayTimePanel, j_xx:2:dayTimePanel, etc). If you are rendering from outside the loop or if you are still having troubles look at the a4j:repeat instead of ui:repeat and check out the ajaxKeys attribute. Cheers, Damian. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4104182#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...