Limit selections in a multi-select list

Hello to all,
is there a way to limit the number of selections from a multi-select list?

For example, in a list of 10 choices I would like to allow 4 different choices.

I tried to use a validation formula like this:

thisrow.column.count() < 5

but without success, i get an error of circular reference.

Any help will be appreciated.
Thanks!

did you have a look at this solution from @Scott_Collier-Weir :slight_smile:

this might be it. cheers, Christiaan

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