Form field validation, using multiple General Condition Macro's

Trying to figure a way to display one of two validation messages on a given bizform field -- dependent on the users value entered. So one validation is for maximum value, and would be 8760. So, I had just used the maximum value check on this one. The message would be that "maximum, 8760", and that is it. The other check on the same field is if the Value >= 501 && Value <= 8760, then the message would be; "see Disclaimer". I had tried for this one the following; Fields["AnnualRunHours"].Value >= 501 && Fields["AnnualRunHours"].Value <= 8760. That however was not working for this scenario. Any help on this would be appreciated. Thanks! :)