title: Openerp - Show discount calculated from price list in quotation/invoice report
body: <p>Is there a way to show discounts calculated from pricelist in the quotation and invoice reports ?</p>
  
  <p>I know there is a module to give a discount manually on an order line, but i can't find a way to show discounts from pricelist.</p>
  
  <p>Thank you for your help</p>