Hello. I have the following code

        <h:selectOneMenu id="kkk" value="#{topologyBean.country}">

                    <f:selectItem itemValue="" itemLabel="" />

                    <f:selectItems value="#{topologyBean.countryList}" var="country"

                        itemValue="#{country.countryLabel}"

                        itemLabel="#{country.countryValue}" />

                    <a4j:ajax listener="#{topologyBean.changeCountry}" render="momo" />

<rich:validator/>

                </h:selectOneMenu>

                <a4j:outputPanel id="momo">

                    <h:outputLabel value="" for="cities" />

                    <h:selectOneMenu id="cities" value="#{topologyBean.city}" rendered="#{topologyBean.cities ne null}">

                        <f:selectItems value="#{topologyBean.cities}" var="cityname"

                            itemValue="#{cityname.citiesLabel}" />

<rich:validator/>                   

                    </h:selectOneMenu>

</a4j:outputPanel>

and i have jsr303 validation NotNull.

1) At the beginning i have only the first list and i press the submit button. I get for the second list ' value cannot be null '

2) When i change the value from the first list then the validation message from the second list disappears. As if i have not submitted the form. How can i make the validation in the second list remain even if i change the value in the fitrst list

thank you a lot

Antonios