The part most tools skip
An extraction you cannot trace is one you either trust blindly or re-check by hand — and re-checking by hand is the work you were trying to automate.
This is why we describe the product as the AI bookkeeper that shows its work. Showing the work is not a nicety here; it is what makes the output usable.
Verification becomes a glance
With the source region drawn, confirming a field takes a second. Without it, confirming a field means opening the PDF, finding the right area, and reading it yourself.
Multiply that by every field on every document and you have the reason document automation so often fails to save time.
It matters most when something looks wrong
If a total seems off, you do not debug the AI. You click the field, look at the highlighted region, and see immediately whether the document really says that or the extraction missed.
That turns an unexplainable output into a checkable one, which is the difference between a tool you can sign off behind and one you cannot.
It carries through to the books
Provenance is not only a review-time feature. Nothing in your books is more than one click from the page it was read off.
Months later, when someone asks where a figure came from, the answer is a click rather than an archaeology project.