filter on unique values in a form's data source

[John]

I have a repeating table that i am filtering with a dropdown list box. I
have the list box data source equal to a field in the repeating table. The
filtering works fine, however, I would like to refine the selection of items
in the list box to be unique entries, since there is duplicate data in the
field of the repeating table. Is there a method of doing this in InfoPath?

Thanks for any guidance.
John

 

[John]

Thank you very mutch. I will give it a try!