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validation rule based on choice on the same screen

I've created a screen of new license with the following fields: License type (enterprise, cloud, trial), expiry date and contact

I've created a validation rule so if a user picked choice other than "Enterprise" without entering an expiry date, he will get an error message. This is the formula:



{!LicenseDropDown} <> {!Enterprise} && {Expiry_Date} == null


I don't get any validation error message. What am I missing?? Is this even possible?