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Checking for empty fields?

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I have a "Display Ad?" field with the options of "Yes" or "No" I also have a container field that

contains jpg file that is an image or ad for a product.

How can I automatically show a message ("No ad is entered!") to the user when he or she selects "Yes" in the "Display Ad?"

field when the container field is empty. Then when the user presses OK, the "Display Ad?" field resets back

to "No"

The existing "Display Ad?" field is currently just a text field.

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You can have a field validation with a calculation of:

Case ( IsEmpty (yourcontainerfield) and DisplayAd="yes"; 0; 1 )

The user can then press revert for it to revert back to the orig value.

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