Vendor bills recorded, approved and paid, with a statement per supplier that reconciles cleanly against the one they send you — because both are built from the same documents.
The argument you have every quarter. A supplier statement that does not match yours is usually a missing bill or a payment applied differently. This is built so you can see which.
Purchase orders · Expenses · GSTR-2B reconciliation · Banking
When they read out their ledger, yours is built from the same documents — so the difference is findable rather than arguable.