  | HasRoleClassReference(RoleFamilyType, Boolean) |
Determines whether this SystemUnitClass object has a SupportedRoleClass with a reference
to the specified RoleClass. If inheritance relations between role classes should be
regarded, the optional parameter 'regardInheritance' should be set. In this case the
specified RoleClass is either identical to a referenced RoleClass or a referenced
RoleClass is derived from the specified RoleClass. Independently of the
regardInheritanceOfRoleClasses
value, always the Role assignments to this
SystemUnitClass and any ancestors of this SystemUnitClass are checked, using the
GetInheritedSupportedRoles
method.
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