LOCAL
      x : SET OF shape_aspect_relationship;
    END_LOCAL;

    IF  relation.relating_shape_aspect IN  relatives THEN
      RETURN  (FALSE);
    END_IF;
    x := QUERY(sa <* bag_to_set(USEDIN(relation.relating_shape_aspect, 'PRODUCT_PROPERTY_DEFINITION_SCHEMA.' + 'SHAPE_ASPECT_RELATIONSHIP.' + 'RELATED_SHAPE_ASPECT')) | specific_relation IN TYPEOF(sa));
    REPEAT i := 1 TO HIINDEX(x);
      IF NOT acyclic_shape_aspect_relationship(x[i], relatives + relation.relating_shape_aspect, specific_relation) THEN
        RETURN  (FALSE);
      END_IF;
    END_REPEAT;
    RETURN (TRUE);