I have two h:selectManyCheckBox with the required attribute set to true. What I want is that the required attribute of both of the components work together.

Only display the error message if and only if both of the selected items list are empty.

Right now my problem is that the message displays if either one of them is empty. Here's my code:

            <rich:panel>
                <f:facet name="header">
                    <h:outputText value="Actualización de catálogos"/>
                </f:facet>

                <h:panelGrid columns="4">

                    <h:outputLabel for="actualizarCatalogoPEC"
                                   value="Actualizar catálogos PEC"/>
                    <h:selectBooleanCheckbox id="actualizarCatalogoPEC"
                                             value="#{administrationBean.actualizaTodosPecChecked}">
                        <f:ajax event="click"
                                render="todosCatalogosPEC"/>
                    </h:selectBooleanCheckbox>

                    <h:outputLabel for="actualizarCatalogoSAGARPA"
                                   value="Actualizar catálogos SAGARPA"/>
                    <h:selectBooleanCheckbox id="actualizarCatalogoSAGARPA"
                                             value="#{administrationBean.actualizaTodosSagarpaChecked}">
                        <f:ajax event="click"
                                render="todosCatalogosSAGARPA"/>
                    </h:selectBooleanCheckbox>

                    <a4j:outputPanel id="todosCatalogosPEC">
                        <h:selectManyCheckbox id="selectCatalogosPEC"
                                              disabled="#{administrationBean.actualizaTodosPecChecked}"
                                              required="true"
                                              value="#{administrationBean.catalogosPecSeleccionados}"
                                              requiredMessage="Seleccione al menos un catálogo"
                                              layout="pageDirection">
                            <f:selectItems value="#{administrationBean.catalogosPecOptions}"/>
                        </h:selectManyCheckbox>
                    </a4j:outputPanel>
                    <h:panelGroup/>
                    <a4j:outputPanel id="todosCatalogosSAGARPA">
                        <h:selectManyCheckbox id="selectCatalogosSAGARPA"
                                              disabled="#{administrationBean.actualizaTodosSagarpaChecked}"
                                              required="true"
                                              value="#{administrationBean.catalogosSagarpaSeleccionados}"
                                              requiredMessage="Seleccione al menos un catálogo"
                                              layout="pageDirection" >
                            <f:selectItems value="#{administrationBean.catalogosSagarpaOptions}"/>
                        </h:selectManyCheckbox>
                    </a4j:outputPanel>
                    <h:panelGroup/>

                    <rich:message id="messageCatalogosPEC"
                                  for="selectCatalogosPEC"/>
                    <h:panelGroup/>
                    <rich:message id="messageCatalogosSAGARPA"
                                  for="selectCatalogosSAGARPA"/>
                    <h:panelGroup/>

                    <a4j:commandButton value="Actualizar catálogos"
                                       render="messageCatalogosPEC"
                                       action="#{administrationBean.doActualizaCatalogos}"/>
                </h:panelGrid>
            </rich:panel>

Cheers