Add option in Catalog Price Rules to select product in stock OR out of stock

[Alegra]

Hello everyone,

Please excuse me for my bad English.

I have Prestashop 1.6.1.4 and most of the products in the store are zero stock but can be ordered.

In this case I want customers who order products with zero stock (pre-order) to receive specific % discount.

How can I add such a filter in the Catalog Price Rules?

 

Please help