Hi Anuma,
Thanks for the Link.
Why is that,Data validation should be dsiabled for secondary data source fields ?
I want to set the AccountId value of contact selector control to another field.So I had applied Rule to set the AccountId's value to another field,but the rule is not working for browser based infopath.
One more point is that, how I can restrict the user not to select more than one user in contact selector ?