[FIX] contract: subtotal miscalculated when price_unit displayed with fewer digits than actual value

This commit addresses an issue in the "contract" module where the subtotal was incorrectly calculated when the price_unit field was displayed with fewer digits than its actual value, resulting in discrepancies of a few cents.

The change made in this commit is: Adding the digits attribute with the value "Product Price" to the price_unit field, ensuring the proper display of decimal places, leading to accurate subtotal calculations and eliminating cent discrepancies.

contract/models/abstract_contract_line.py

@@ -39,6 +39,7 @@ class ContractAbstractContractLine(models.AbstractModel):
         string="Unit Price",
         compute="_compute_price_unit",
         inverse="_inverse_price_unit",
+        digits="Product Price",
     )
     price_subtotal = fields.Float(
         compute="_compute_price_subtotal",

contract/readme/CONTRIBUTORS.rst

@@ -14,3 +14,4 @@
     * Rafael Blasco
     * Víctor Martínez
 * Iván Antón <ozono@ozonomultimedia.com>
+* Eric Antones <eantones@nuobit.com>