Give error message

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Feb 22, 2014
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I have a form in access 2013 that fills in city and county when a zip code is entered from tblZipCodes. After all the information is entered into the last field access will give an error message if the zip code entered is not a valid code. I would like to give my own error message on the after update event of the zip code field. How can I do that?
 
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