Issue with adding product bundles to Constraint rule

I am trying to create a rule in Constraint Builder but when I try to add the product, I do not see all. I have this product bundle that has three child components. When I add the products, the child products are not showing up in the list. all the products are active. When I add the product and go to CML Editor, I do not see the child products either only this: type Parent_Product : LineItem;