7 – Is there any way to create a discount that only discounts a product in an order?

We have a Drupal 7 site that uses Commerce and Discounts and we need to create a discount that will discount a product of the order 100%.

Basically, we must grant a discount coupon for ONE free product, but so far we only see one way to discount ALL the products in the order or in the entire order.

We have tested Commerce Discount EXTRA (module) and are close to using the "Discount per product by quantity", but forces you to select a specific product to which the discount would be applied instead of ANY product.

So, does anyone know of a way to achieve the creation of a discount to only discount ONE OF ANY product in an order?