There is a BusinessPartnerRoleType table connecting BusinessPartner and RoleType in Address Book form (one Partner can have more roles).
How can I filter Business partners by its roles, best way by using existing data structure?
Now I remember - it’s pretty simple, of course
In Data structure/Detail entity set RelationType = FilterParent.
(In this case on RoleType entity).
In this case you have to copy a data structure.