Is there a way to get a report that will explain how a price, for a product, a quantity, a partner... is calculated ?

A report that would show each step followed by OpenERP, in order to calculate a selling price, according to the various rules /pricelists ?

My point : in a sale order, we just "get" the final price... but sometimes it's necessary to be able to explain the calculation to the customer, especially when many rules applies (discount, quantity, partner, product, product category... and even dates of validity for pricelists etc).