This module useful to show history of cost price for product, you can also track history of cost price of product for different suppliers. Easy to find rates you given to that supplier in past for that product.
The module allows you to set discount in fixed/percent basis for purchase orders and order lines separately. The total discount in an order is sum of global discount and order line discount.
Using All in One Import App, user can easily import large amount of data into the odoo system from excel files.