Many lifetimes ago I ran the accounting function for a company. It was part of a much larger group and had subsidiaries in 10 European countries, reported to the USA and was ultimately Canadian. I had 18 staff, and dealing with employees expense claims was part of the remit of the department.
One full time clerk, numerate and literate but not professionally qualified, dealt with processing expense claims. The cashier arranged payment of them once approved, just one part of her job.
I dealt with any queries - things that seemed excessive, odd, unsupported, or outside of the rulebook.
We had expense claims from sales teams, directors, auditors, engineers, van drivers, a whole variety of people and circumstances.
We had the occasional argument, usually with the Sales Director about throwing out his salesmens' claims, but at the end of the day I could always win the argument by reference to the Inland Revenue's rules on wholly, entirely, and necessarily incurred whilst doing the job. Of course, there was also a lot of backing from the Company Rule Book and the general fear of the Internal Audit Gestapo and the External Auditors.
I find the costs of running the IPSA set up quite baffling. I'm pretty sure I could do it for rather less....
The Penguin