Set type problem in sales order integrated into loyalty management

Hi experts,

I try to implement the sales order integrated into loyalty management. As notes said, I should use the set type REWARD_PRO_LOY to assign to a hierarchy for loyalty. But when I use this set type in hierarchy, I found I can only assign it when I choose "service" for product type. Then I find in the "REWARD_PRO_LOY" set type, there is a switch tab. In the tab, there is only "services". I don't understand this tab means. I want to assign this set type to "materials" type. I tried to created a new set type with the same attributes, but it seemed not to work. Is anybody can give me some advice to solve the problem?

Thanks a lot,

Best Regards,

Molly Xin