The result of selection formula must be a boolean in Crystal Report

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You're attempting to return a date in a selection formula (Whether it is a Record, Group, or Saved Data selection formula) and CR doesn't know how to handle that situation. It must be a boolean because selection formulas essentially tell the report to only include data where the formula evaluates to TRUE.
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Instead of  that ,you can directly click "Use Editor" ..  Without selection or group formula you will get all type operators.

Hope this will help you !!

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