Not allow select more than 1 time from drop-down

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1

I have a repeating form, a drop down field to display family member name.
Can I prevent data collector select a family member more than 1 time?
Is there any solution?

Thanks a lot for any suggestion.

2

Hi and welcome to the forum! If you have a moment, introduce yourself here!

What kind of Select are you using, SelectOne or SelectMultiple?

Could you share your form here, or a very basic example form where you can show how users could (but should not) select an option multiple times?

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