I'm about to have a discussion with my travel office. For whatever reason, they decided to apply the option of the reimbursement of my actual expenses to my previous trip instead of the flat rate they normally use. In practical terms it means that normally I would get my per diem (pretty fat in this case) and use it the way I like. This time they would only reimburse what I actually spent, and what qualifies as necessary (meals and transportation). The difference is quite significant and I'm concerned...