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No, but upon adding yet another duplicate, you would get a dialog like this:
This isn't the kind of dialog a user should see or have to understand or decide how to proceed with, however.
It's always a good idea to experiment with a play layout to see what happens first.
Note that FMP using Find and "!" will find all the duplicates including the single value. So, if you're going to write a script, be careful how you delete duplicate entries. There's no undo for a delete in FMP that I'm aware of (other than a backup...).
Thanks. I wanted to fix it but was afraid it would damage the existing records.