I too would like to hear from the OP regarding the specific circumstances. Playing shenanigans with expense reports and billing is just asking for trouble. Not saying that is the case here, but I can't think of any reasonable reasons to shield the fare for business travel from anyone.

A guy in my office (same office as above, but different guy) had more United miles than he knew what do do with. Sometimes he would book an expensive plane ticket, generate the receipt, and then cancel the trip instead using miles to book. He would then turn the original receipt in for reimbursement at the end of his trip. I never could say anything about it because this guy could make my life miserable if he wanted to...