Access how to move a calculated field

[wittyinventor]

I have two columns in a table [Mileage End] and [Mileage ST]

I have created a form and input a field that gives me the difference between these two fields in the table. Field is called [Mileage]

This works no problem.

Now I need to create a report that shows the information from the field [Mileage] in the form.

Can't seem to get this to work. I setup a text box and bound this to the field in the form [Mileage] does not work.

Any help out there?

Thanks