Promotion default child product

Hello Colleagues,

 

On the vanilla 8.1.1 application a customer has a product promotion that has 2 instances of the same complex product. The complex product definition has a class relationship with 2 child products in the domain. Child product 1 is the default product in the promotion rules for the first complex product and child product 2 is the default product in the promotion for the second same complex product. When the promotion is added to a sales order then the child product 2 is incorrectly not added as a default line item for the second instance of the complex product. The