On the form 1098-T in box 1 and 2 why can't I put the amount I paid and the amount I was billed? They are the same amount.

On the actual form 1098-T it shows nothing in box 1, Payments Received, but shows the amount billed by the school for tuition (which I did pay).  I'm not able to enter that number into both boxes even though I paid the same amount that I was billed.