529 Plan disribution and rent payment.f the

Hi, my son had used a small part of his 529 distribution to pay for about 4 months of his off-campus rent  ( I paid his rent for the rest of the time). Now I have an excess of the distribution not reflected in 1098T. I understand that I can claim this as room and board expense. Turbotax asks to put his room and board expenses, do I put the amount used from 529 Distribution, or the whole year's (12 month) expense (mostly paid by me)

 

Thank you for your help