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Using a constraint with a select_one question

Question asked by Oharani54 on Jan 23, 2017

I have a select one question where I want the user to receive a warning if they answer incorrectly and to try again. I put .!='Mammal' in the constraint field, but it still allows me to select mammal without issuing the constraint message and allows me to continue the survey. How can i get it to display the constraint message with a select one question?