About ReadyAPI FORM, Validates the current form values

We have an option in ready api , Form 

when it comes to request, i am reading all data from the data source/data Gen, but as soon as i toggled to Form, the value will be considered as ${AutoDataGen#Base_SiteID}, and when i try to do validates the current form values, its giving warning saying 

so how to resolve this and how to make this to read data from data gen ${AutoDataGen#Base_SiteID}

and is there any way to fail the testcase based on this warnings.? or any other way to validated contracts request params by providing some data's( so that it should validate regex, data type,min and max values).?