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SUBMIT YOUR IDEAThe challenge_365_solution app does not contain an error message for "Sorry, the ID number you entered does not exist."
I would have liked to have seen how you include an error message when a user enters an ID that doesn't match to an ID in the column ID. I've only seen error message displayed when the input doesn't match a certain format.
The best Error Message Expression I could come up with is
REGEX_Match([#1], '^(?!\d{4,5}$).*$')
this will only be true when its not a 4 or 5 digit number. This will still allow invalid 4 or 5 digit IDs to pass through the workflow and the user will only realize once they open an empty PDF.