LOCAL
     x : SET OF Physical_network_group_element_relationship := [];
  END_LOCAL;

    IF  relation.relating_group IN  relatives THEN
      RETURN  (FALSE);
    END_IF;
    x := QUERY(pd <* bag_to_set(USEDIN(relation.relating_group,
      'LAYERED_INTERCONNECT_MODULE_DESIGN_ARM.' +
      'PHYSICAL_NETWORK_GROUP_ELEMENT_RELATIONSHIP.' +
      'RELATED_GROUP')) | specific_relation IN TYPEOF(pd));
    REPEAT i := 1 TO HIINDEX(x);
      IF NOT acyclic_physical_network_group_element_relationship(x[i], relatives +
        relation.relating_group, specific_relation) THEN
        RETURN  (FALSE);
      END_IF;
    END_REPEAT;
    RETURN (TRUE);