Update Definition Does not recreate sample values

Hello,
In my WSDL Settings preferences, I initially had 'Sample Values' unchecked so that when a WSDL is imported all the elements have '?' as their value. I think 'checked Sample Values' and did 'Update Definition -> RecreateRequest etc' but the interface still had '?' in the element's values.

Should it create the request with 'sample values' inside.

Thanks

Ali