I know you say he's not paid a thing other than child support, but you've got your son in a very expensive school and you say he's paid for that. If so, then what coudl POSSIBLY be the harm in proving that he paid it?

It may be part of him proving that he's paid to support your child, for the courts.

Heck, it could be that he's got a new girlfriend who is angry that they have to go dutch every time they go out and he wants to prove that he really does pay for this expensive schooling. Or it could be some tax or charitable contribution deduction he's looking for... some tuition credit... If he's really earning more than you are, then he does deserve to get the tax benefit of being current on support and having paid the tuition.

If he's paid the tuition, give him the receipts for his payments. You could be obstructive and require him to contact the school or subpoena them directly, but that would increase his legal fees, increase the difficulty of getting the divorce over with, and decrease the likelihood of continuing to pay this stuff in the future.

If I get a vote on this: I say approach it as if he's doing the right thng and give him a receipt for stuff if he's paid it. OR... be suspicious, don't give him a receipt for stuff he paid for, and risk starting world war III over the fact that he DID, in fact, pay for something and maybe deserves credit for that payment.