Good evening
 A concern under odoo

 I would like to add a new ug (graduated unit) field of type float in the purchase order lines.  This field must be added to the quantity field without modifying the price of the item in question.

 Example:
 I buy product A of quantity 3 and the supplier gives me a graduated unit of 2.
 Knowing that the unit price of the product is 500,
 I would like that to put me 5 in stock but by calculating that ignores the ug, so that makes rather 500 * 3 = 1500