Even if you support consuming UBL or an other HTTP like format or anything really, tracking expenses will continue to be a Hard Problem (tm). I ran expenses fo

Even if you support consuming UBL or an other HTTP like format or anything really, tracking expenses will continue to be a Hard Problem (tm). I ran expenses for a fairly large producing organization this summer. I got large stacks of unorganized and under-descriptive receipts every day. Including receipts from flea markets, amish bakeries, and more. Not to mention PO purchases, check requests, petty cash withdrawals, partial returns, returns to cash, and more. No matter what, more than an automaton, you need someone who understands the business process. You need someone who can look at a receipt and not only know how much was spent and on what SKU, but what that actually item is for, and if it's a valid expense.