<p>A user shall be able to provide a discount amount (percentage or fixed) to either suppliers or customers. That is suppliers or customers can have a fixed discount of the total amount of either sale, invoice, quote or purchase order. Suppliers giving you a discounts from a purchase should be an input when creating a purchase order and also customers who frequent (not neccesarily) a user's business can be given a discount of the total amount of the transaction due to them.</p>