Vendor bills get checked, not just filed.
A padded parts invoice, or a PO nobody raised, is where margin quietly leaves a shop. Here every bill is matched back to what was approved on the repair before it is paid.
Parts ordered against the repair.
The part, the vendor and the price sit on the RO they were ordered for, not in a separate list someone has to reconcile later.
Vendor invoices matched to the approval.
The invoice is compared with what was approved on the estimate or the supplement, so the difference surfaces before it is paid rather than at month end.
Supplements captured when the money changes.
When the repair grows, the supplemental parts and labour land on the same record, so the approval and the bill stay together.
Purchase orders that reconcile.
POs, sublet and outside work tie back to a car, so nothing arrives that nobody can match to a job.