Hello Mendix friends: I have created a dropdown menu with values : 1, 2 and 3. Each time a user selects one number, and clicks "save" button, the information will be stored in another page. My purpose is to allow the user to select "ONLY" one number from 1 2 and 3 , so he can not choose number 1 again after he selected 1 from the dropdown menu and saved the selection.
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