Add/Modify Vendors of the Inventory Item On this screen you set which vendor supplies an inventory item and on what terms: order unit, equivalence, price and discount. How to get here: Add or Modify button on the Add/Modify Inventory Items screen. Vendor details Vendor: choose it from the drop-down list, which is configured on the Vendors screen. Inventory Item Code: it must match the code of the inventory item you entered on the Add/Modify Inventory Items screen. Order unit: the unit in which the inventory item is itemised on the vendor's delivery note. Equivalence: the equivalence between the stockroom unit and the order unit. Price: the price the vendor sets for the order unit. Discount: the discount percentage the vendor gives you, if any. Buttons Ok: saves the vendor once you have finished configuring it. Cancel: closes the screen without saving the changes.