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Simple validation of yes/no field

Question asked by ryk on Dec 19, 2017
Latest reply on Dec 19, 2017 by sojanm

For some reason, a proper validation of a yes/no checkbox on a form is eluding me. I've created a validation rule of: 

{Self}=="No"
to trigger a message to check the box, but the validation doesn't trigger. I've tried using values of no, No, False, false, FALSE, and even tried coming at it from the other way, e.g. {Self}!="Yes"   
I've verified that the field contents properly get stored as "No" or "Yes".   What gives?

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