I have a form where I can add values from another table using a REF element type.
I want the user to not be able to select the same value (hide the value from the list if he/she already selects it) I believe this is possible using a Valid If formula, but I’ve been trying to create the expression without success.
Here’s a screenshot of the problem I have:
I want to know if this is possible. If yes, I appreciate if someone can help me