Defining a dialog box field as "mandatory" only works for some types of fields. For example, it works for a text field, but it does not work for other types, like date.
Use "savecall." See http://docs.day.com/en/home/communique_3/docucq355/programming/libraries2/cfclibrary/cfccontrols18/cfccontrols0/cfccontrols2.html for details.
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