```
<h:form id="formEdit">
    <p:selectOneMenu value="#{testView.selection}"
                     required="true">
        <f:selectItem itemValue="noMenu" itemLabel="selectOneMenu not rendered"/>
        <f:selectItem itemValue="haveMenu" itemLabel="selectOneMenu rendered"/>
        <p:ajax update="formEdit"/>
    </p:selectOneMenu>
    <p:panel>
        <p:selectOneMenu id="conditionallyRnedered" value="#{testView.value}"
                         rendered="#{testView.selection eq 'haveMenu'}"
                         required="true">
            <f:selectItem itemValue="#{null}" itemLabel="-" noSelectionOption="true"/>
        </p:selectOneMenu>
    </p:panel>
    <p:messages id="messages"/>
    <p:commandButton value="Submit"/>
</h:form>

```

Component `"conditionallyRnedered"` is required, and rendered on page after i select `"haveMenu"` value in first menu. This component have only empty option and initialy its not rendered on page. If i press Submit button, then response is:

```
<partial-response><changes>
<update id="javax.faces.ViewState"><![CDATA[stateless]]></update>
</changes></partial-response>

```

**There is no validation error**. If i change value of `rendered` attribute in `"conditionallyRnedered"` from `"#{testView.selection eq 'haveMenu'}"` to just `"true"`, then response is:

```
<partial-response><changes>
<update id="javax.faces.ViewState"><![CDATA[stateless]]></update>
<extension ln="primefaces" type="args">{"validationFailed":true}</extension></changes>
</partial-response>

```

**Validation error returned**. The questions is:

1. Why conditionally rendered component is not validated?
2. It is possible to make them validated?

**UPD**
Originally in my question is absent Bean source code, in which Bean declared as `@ViewScoped`. After read [@BalusC comment](https://stackoverflow.com/questions/33785199/primefaces-dont-validate-ajax-rendered-component#comment55365948_33787000), i try to change scope from `@ViewScoped` to `@SessionScoped`, and after that validation is working correctly. Wherein `javax.faces.ViewState` in response changed from `stateless` to some view id:

```
<update id="javax.faces.ViewState">-5902669082498843838:729675320168079573</update>

```

I still doubt, this is solution or still workaround, because I thought that instance of `@ViewScoped` bean is exist while we dont left the page. Maybe this behavior is caused by the fact that in the same page present another bean, with `@SessionScoped` scope.