Why can't I reference a user defined type field when using nested queries?

CREATE OR REPLACE TYPE METRIC_IMPERIAL_DISTANCE AS OBJECT
(
  METERS_FEET INTEGER,
  CENTIMETERS_INCHES INTEGER,
  FRACTION NUMBER
)

SELECT t_id, get_distance_breakdown (h.height, h.unit_of_measure_id) height_breakdown
    	FROM   heights h

SELECT t_id, get_distance_breakdown (h.height, h.unit_of_measure_id).meters_feet height_meters_feet
    	FROM   heights h

SELECT t_id, height_breakdown.meters_feet
FROM   (SELECT t_id, get_distance_breakdown (h.height, h.unit_of_measure_id) height_breakdown
    	FROM   heights h);

SELECT v.t_id, v.height_breakdown.meters_feet
FROM   (SELECT t_id, get_distance_breakdown (h.height, h.unit_of_measure_id) height_breakdown
        FROM   heights h) v;