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If Field 1 Is Yes, Then Field 2 Must Have Comment


I just can't figure this out..I have two fields in my database that I want to be able to have a regulation that if the user Enter Yes to field1 than they MUST enter some comment on field2. They can't skip it. However, Field1=No, they can skip field2..Is this possible? is this have something to do data validation? Please help..thanks in advance..


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