Order it, receive it, and let the system refuse any bill that exceeds what arrived — then pay when you choose, with the supplier ledger and AP ageing current at every step.
Three documents, one chain. Bill against a receipt and the quantities are not merely displayed for comparison — they are enforced. A line that exceeds what the warehouse signed for is rejected outright, so a supplier cannot invoice you for forty units against a delivery of thirty-eight.
"Which bills did that AED 40,000 cover?" has an exact answer, forever.
Supplier reconciliation calls end when both sides read from the same statement.