Ramya,
Hi. Well a few of the specific features related to validation there are for server side validation only. In your case you had client side validation and server side validation turned on so client side validation was taking place before server side and this particular feature only can work on server side validation. The bigger problem I found during testing this though is that server side validation did not fire for this field!!!
I am not sure yet if this is because its a different build on the www.betasprings.com site or not yet, I am going to test on our development environments locally tomorrow. If a patch is needed it should be an easy one.
-Chad