Every accounting firm we talk to has someone checking VAT math by hand, hoping a receipt won't come back to bite them at review time. Upload one and watch.
A scanner can tell you the words on the page say "Official Receipt." It can't tell you that means the document won't support an input VAT claim if a client tries to use it. That's not a reading problem. It's an understanding problem, and it's the part most tools skip.
Handwriting, stamps, faded thermal paper. Whatever's actually printed, not just the clean lines.
VAT, totals, the numbers that are supposed to add up and sometimes quietly don't.
Which document actually supports a claim, and which one just looks like it does.