The limitation for a total discount is the total amount subject to the discount. In this field, you can specify the number of sales/purchase units that are to be specified on the sales or order line in order to generate the current price/discount agreement. In this way, you can set up volume-related prices and discounts. If you do not specify a number, the system assumes that the price is per unit. This field is also used to specify the invoice amount that may generate a total discount.