This field gives you the option of pricing items that are not sold per unit but only in larger units, for example 1 pack of 100 units for 24.75. When the invoice for the order line is updated, the item receipt is posted in inventory with the value per unit. If the standard price unit of the item is other than 1, you can specify the unit in the and tables. More information about how the is used to calculate the line amount can be found in the field.