Sale Coupon Domain Product Reward Fixed Price

This module is a technical bridge that connects two existing promotion features in Odoo Sales: fixed-price rewards and product-specific discount rules. It does not add new menus or screens; it changes how an existing promotion behaves on a sales order.

When a promotion is set to apply a fixed price and is limited to specific products, the module checks the products on the sales order lines. Only the lines whose product matches the promotion's product filter are updated with the fixed price. Lines that are already reward lines are left untouched, and lines for products outside the filter keep their original price.

If the promotion is not set to specific products, the module simply falls back to the standard fixed-price behaviour. This means the fixed price is applied as before, without the product filter.

The module touches the sale.order model and works together with the promotion program configuration. It is installed automatically when both related modules are present, so users do not need to install it manually. The result is that a fixed-price promotion can be restricted to a chosen set of products, giving more precise control over which items get the special price.