[thoraway1010]

It's not just enterprise - many small / mid size places are much much happier (myself included) with an invoice attached.

AWS gets this right (even though invoice is high level). You get something that can be quickly forwarded down / up and around and end up in the AP system / accounting system etc in good shape (ie, vs a 6 page PDF of an email chain). They just care that third party invoice is there in good shape with approval by whoever owns the expense line its hitting.