serveside validation

I can't make it work.
In my understanding, if I select "YES" in the "enable server side validation" field of the Validation tab and put the following code in the code window:

<?php

return 'NO';

?>

The form should NOT be submitted end "NO" should be displayed.
Insted the form IS submited (server validation ignored?).

What am I missing? What else should I do to enable server side validation?

Thanks for your help.

Andrea

Hi Andrea,

are you sure you have the "server side validation enabled ==> yes" ?? because your code works here fine on V3.1 RC2

Regards
Max