trytond-purchase_supplier_discount/doc/index.rst

Discount in supplier prices
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This module allows to define a discount in product's supplier price.

The "Unit price" field is calculated from the "Discount" and the
"Gross unit price" as:

Unit price = Gross unit price * (1 - Discount)

By default the number of decimal places of "Gross unit price" and "Discount" is
4. The number of decimal places of "Unit Price" is the sum of both, by defaul
8.
To change the number of decimal places of "Gross unit price" and / or
"Discount", for example 3 and 2 respectively, you can define the following
variables in trytond configuration file:

unit_price_digits = 3
discount_digits = 2