Supplier invoices: understanding the bill and its supporting evidence

A supplier invoice records the amount being billed. Matching it to the order and receipt helps detect price differences, duplicate billing and quantities not received. A direct invoice is useful for an appropriate purchase without a receipt source, but it still requires a clear basis for the charge.

DNA can select one or more GRNs and populate the remaining quantities. For the reviewed receipt-linked quantity input, an entered amount above the displayed remaining quantity is clamped to that remainder. This is an entry control, not independent proof that every external import or server path enforces the same condition. Manual item lines and GL lines are also supported. Receipt-linked discounts are restricted to preserve source consistency.

What matching is intended to establish

Matching compares the commercial agreement, the accepted supply, and the amount billed. It helps identify whether the supplier's price and quantity are consistent with what the company expected and received.

A difference is a question to resolve, not automatic proof that the supplier is wrong. An authorised price change, additional delivery, or agreed charge may explain it. Equally, a familiar supplier's invoice should not be treated as correct merely because previous invoices were reliable.

Remaining quantities

A GRN received 70 units and 50 have already been invoiced. Only 20 remain available for another invoice against that receipt. A supplier sends a bill for 30; investigate the difference rather than forcing the invoice by changing unrelated quantities.

The 20 remaining units describe the unbilled portion of that receipt. They should not be confused with the unreceived portion of the purchase order. The two balances belong to different stages of the process.

Item and account lines

DNA supports both item lines and general-ledger lines in supplier invoicing. Item lines identify the goods or services represented through item records. GL lines support charges that need an account and relevant cost allocation rather than an inventory quantity alone.

The correct representation depends on the nature of the purchase. Forcing a service fee into an unrelated stock item can distort inventory. Recording a stock purchase only as an unexplained expense can lose the operational relationship to goods received.

Source consistency and discounts

Receipt-linked information can be restricted to preserve the accepted source basis. A supplier discount applied earlier should not be recreated in a way that doubles the concession or changes the meaning of the original agreement.

The invoice total also depends on its currency, tax treatment, and additional charges. These components should be understandable separately so that a price difference is not confused with a tax or freight difference.

From billing to settlement

Recording a supplier invoice establishes the billed position under the supported workflow. It does not prove that the invoice has been paid. Credits, advances, and allocations can affect the amount still to settle.

A reliable invoice review explains the source supply, the agreed price basis, any authorised differences, and the resulting obligation. That explanation supports accurate payment planning and reduces disputes caused by incomplete records.