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Example: Reject duplicated file names in attachments

How to configure a validation for rejecting attachments with repeated file names?

Use Boolean validator with math, date-time or text-string terms with the following configuration:

Boolean expression is: count(toStringList(%{00071})) = count(distinct(toStringList(%{00071})))

Note that:

  • %{00071} is field code for "Attachments"

Other examples of that function