How to handle multiple spatial operators and\or-ed in 10g express(locator)?

I've noticed that I cannot run certain queries in 10g express, which run perfectly in 10g enterprise.
The following query is an example:
SELECT S_ID, SDO_NN_DISTANCE(1) from MAP.BYGG_POLY
where
SDO_WITHIN_DISTANCE(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'distance=17.4620649504359') = 'TRUE'
AND
SDO_NN(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'sdo_num_res=10', 1) = 'TRUE';
In the express edition the query results in an error message:
ORA-13249: SDO_NN cannot be evaluated without using index
But if I split the select into two seperate selects, I get no error:
SELECT S_ID from MAP.BYGG_POLY
where
SDO_WITHIN_DISTANCE(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'distance=17.4620649504359') = 'TRUE';
SELECT S_ID, SDO_NN_DISTANCE(1) from MAP.BYGG_POLY
where
SDO_NN(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'sdo_num_res=10', 1) = 'TRUE';
Moreover I've found that inner select also seems to work as a workaround.
So the following query is valid in the express edition:
SELECT S_ID, SDO_NN_DISTANCE(1) from MAP.BYGG_POLY
where
SDO_NN(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'sdo_num_res=10', 1) = 'TRUE'
AND
S_ID in (
SELECT S_ID from MAP.BYGG_POLY
where
SDO_WITHIN_DISTANCE(GEOM, mdsys.sdo_geometry(2001, NULL, sdo_point_type(441702.780259307,6445401.66207384,NULL), NULL, NULL), 'distance=17.4620649504359') = 'TRUE');
Could someone please explain to me why the first query is invalid in the express edition?
...or am I doing something wrong?

SDO_RELATE returns some strange results though.
If I use mask=inside for a given query I get 69 rows, and for mask=overlapbdyintersect I get 15 rows.
But if I use mask=inside+overlapbdyintersect, I only get 50 rows.
Then again if i use UNION ALL, for speed as the manual hints about, I get 84 rows as result if I combine the two.
Isn't this a bit odd?
Any explanation for this kind of behavior?
examples:
INSIDE(69) + OVERLAPBDYINTERSECT(15) = 50 (Strange)
SELECT count(S_ID) from MAP.BYGG_POLY
where
SDO_RELATE(GEOM, SDO_UTIL.FROM_WKTGEOMETRY
*('Polygon((441029.298070891 6445795.42259877, 441320.756519155 6445767.05053744, 441318.177240852 6445527.17765524, 441029.298070891 6445795.42259877))'),*
*'mask=INSIDE+OVERLAPBDYINTERSECT') = 'TRUE'*
INSIDE(69) + OVERLAPBDYINTERSECT(15) = 84 (Correct)
SELECT S_ID from MAP.BYGG_POLY
where
SDO_RELATE(GEOM, SDO_UTIL.FROM_WKTGEOMETRY
*('Polygon((441029.298070891 6445795.42259877, 441320.756519155 6445767.05053744, 441318.177240852 6445527.17765524, 441029.298070891 6445795.42259877))'),*
*'mask=INSIDE') = 'TRUE'*
UNION ALL
SELECT S_ID from MAP.BYGG_POLY
where
SDO_RELATE(GEOM, SDO_UTIL.FROM_WKTGEOMETRY
*('Polygon((441029.298070891 6445795.42259877, 441320.756519155 6445767.05053744, 441318.177240852 6445527.17765524, 441029.298070891 6445795.42259877))'),*
*'mask=OVERLAPBDYINTERSECT') = 'TRUE'*
Edited by: Oraly on Sep 2, 2009 5:32 AM
Edited by: Oraly on Sep 2, 2009 5:34 AM

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