When retrieving the sale price of the item, the ‘gross_price’ field of the product is called directly.
To facilitate the integration (override) of other modules, could we not consider the use of a @property ‘gross_price_used’ on the model of ‘list_price_used’ of the Sale module?
The problem is that with POS normally the prices are tagged on the product so there is no computation that should change the price.