Sale Order Line Price Source Tracking

This module adds price provenance information to sale order lines. For every line, Odoo now records whether the unit price came from a pricelist rule, from the product's own sales price, or from a manual change made by the user.

• On the sale order form, three extra columns are available on the order lines list (hidden by default, you can enable them): the price source, the specific pricelist rule applied, and the pricelist itself. The order lines list also opens the line form view.
• The same three read-only fields appear on the standalone sale order line form and on the sale order line list view.

The source is recalculated automatically whenever relevant line data changes, such as the product, unit of measure, quantity, or price. If the price differs from the technical price computed by Odoo, the line is marked as a manual override; otherwise, if a pricelist rule applies, it is marked as coming from the pricelist and the rule is stored; if neither applies, it falls back to the product sales price. Resetting the price unit also refreshes the source.

All fields are read-only, so users cannot edit the source directly; it is derived from the actual pricing behaviour. This helps sales and accounting staff audit why a given price was used on an order.