The document discusses the 3-way matching functionality in Odoo 15, which allows for the verification of vendor bills against purchase orders and receipts to ensure payments are made only for products received. It outlines the steps to enable this feature in the purchase module settings and how the system will automatically update the bill payment status based on received quantities. The feature helps prevent errors such as paying for fake vendor bills by providing options to either pay, don't pay, or note exceptions based on discrepancies in ordered, billed, and received quantities.
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