The Purchase Order History feature in Odoo helps you see past purchase details for a product while creating a new purchase order. When you select a product and vendor, the system shows the last prices, quantities, and order dates from previous purchases. This helps you make better buying decisions, compare past rates, and avoid overpaying. It's especially useful for buyers who manage multiple vendors for the same product. You don't need to search manually. Everything appears right in the purchase order form. It saves time, improves accuracy, and supports smart purchasing with a full vendor history at your fingertips.