Is there a way to prevent a value in a number field from being greater than another number field?

I have a form with three fields. One labeled "Beginning Mileage", a second called "Ending Mileage", and a final one called "Distance". I currently have a condition set on "Distance", that calculates the difference between Beginning and Ending Mileage. I want prevent anyone from entering a Ending Mileage that is greater than the Beginning Mileage, what would be the easiest way to accomplish this?

Yes its possible. You can try using a calculation condition to test if the start is greater than the end. And if it is change it to zero

Is there any way to set the field to empty, instead of 0?

Please delete the previous condition (or disable it). And then try this condition:

The blank space is where you press the spacebar x1 and hit enter. 

This works perfectly for me. Thank you!