I am using freemember forms to create my "registration" page. I have two custom member fields "employee last name" and "employee id". I added them in the "custom member fields" section. I need to make these two fields unique and fail the registration process if the values entered in the registration process are duplicates.
I could not find "unique" attribute in the custom member fields. Only "required" attribute. any help in this regards will be much appreciated.