Tryton application platform - sale discount module

 Tryton is a high-level general purpose application platform. It is the base
 of a complete business solution as well as a comprehensive health and hospital
 information system (GNUHealth).
 .
 The sale_discount module adds discount on sale line.
 .
 Two discount fields are added to the sale line to define a discount as rate and
 as amount between a base price and the unit price.
 The base price is filled automatically with the list price of the product.