I bumped into that problem today at work. To make long story short I want to skip validation phase (in fact also not check required attribute) while using `p:ajax` component, though I want to update model in bean. 

To illustrate the problem:

View:

```
<h:form>
    <p:messages id="msg" />
    <p:selectBooleanCheckbox value="#{bean.flag}">
        <p:ajax listener="#{bean.flagChanged}" update="@form" />
    </p:selectBooleanCheckbox>
    <p:inputText value="#{bean.value}" required="true"
        disabled="#{bean.flag}" validator="#{bean.validate}">
        <p:ajax event="keyup" update="msg" />
    </p:inputText>
    <p:commandButton />
</h:form>

```

Bean:

```
public class Bean {
    private Integer value;
    private Integer prevValue;
    private boolean flag;

    public void flagChanged() {
        if (!flag) {
            value = prevValue;
        } else {
            prevValue = value;
            value = null;
        }
    }

    // value and flag setters and getters

    public void validate(FacesContext facesContext, UIComponent uiComponent, Object value) {
        Integer number = (Integer) value;

        if (number == 7) {
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "7 is my lucky number", ""));
        }
    }
}

```

Checkbox is to disable and enable input text simultaneously hiding value when it is disabled and restoring it when it is enabled. Problem occures when user fills wrong value that is validated immediately and therefore not updated into the bean. So after clicking and unclicking checkbox previous correct value is restored. The very same situation happens while deleting previous value and leaving blank field (`required` is set to `true` and hence again previous value is restored).

I tried to set `immediate=true`, but that changes nothing, so I'm wondering if there is any way to skip validation phase in `p:ajax`. Maybe I am trying to achieve this in not exactly proper way (any hints appreciated!), but I would like to know if that approach is somehow possible to accomplish.