Only want user to put in one value

Here's the situation: 

 

I have a module with two Boolean line items that should act as the inverse of each other. As an end user, I should not be able to click both boxes. Screenshot below 

JR1010_0-1662650119003.png

 

 

Basically, If the user picks the home team to win they should not be able to choose the Away Team to Win.
 
I thought IF Home Team to Win? = TRUE ELSE FALSE would work but I continue to get this error. 
 
Thanks!

 

 

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