When a supplier asks for a price change, a business needs to understand the request before deciding how to respond. A higher invoice might reflect a different unit price, a larger order, a faster delivery or a change in specifications. Treating these possibilities as one problem can send a sales team into negotiations with an explanation it cannot defend.
A useful review brings purchasing, operations and sales around comparable information. The question is not which department can produce the most persuasive number. It is whether everyone is describing the same transaction, period and conditions. That common starting point makes disagreements easier to examine.
Take a hypothetical order requiring an unusually short delivery time. Its extra cost may belong to that particular promise. Passing it into a general price increase without examining the cause would conceal a choice the business itself made. Equally, refusing every supplier request without investigation can close off options that might work for both parties.
The practical outcome should be a decision that staff can explain consistently: what changes, why it changes and when the arrangement will be reviewed. Customers may still decline. Clarity does not remove negotiation; it gives negotiation a reliable basis. Managers also need to record any exceptions, so the next review can distinguish a deliberate commercial choice from an unexplained departure from the rules. A well documented decision is easier to improve than a story reconstructed after the result is known.