It seems to me that there is a conversion or validation error, so neither the model gets updated nor the action gets called. Is there a messages component in the form? Any undelivered messages will also be logged.
Try putting the following in the form (it is automatically re-render on AJAX):
<rich:messages globalOnly="false" />
Thanks for that , I got value is not valid this message on the web page, do you know what is this mean?
Could You show Your XHTML code?