Seems that SDO_CS has problems in transforming ARC geometries:
--LINE geometrie works fine
SELECT SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(geom,0.01) val
,SDO_CS.TRANSFORM(geom,4326) trafo
FROM
(SELECT sdo_geometry
(2002, 25832, NULL,
sdo_elem_info_array (1,2,1),
sdo_ordinate_array(
500014,5650010,
500010,5650014,
500006,5650010)
) geom
FROM dual);
TRUE
MDSYS.SDO_GEOMETRY(2002,4326,NULL,
MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1),
MDSYS.SDO_ORDINATE_ARRAY(
9.0001995237432,51.0016646160954,
9.00014251706963,51.0017005861695,
9.00008551017565,51.0016646162345))
--ARC geometrie gives ERROR
SELECT SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(geom,0.01) val
,SDO_CS.TRANSFORM(geom,4326) trafo
FROM
(SELECT sdo_geometry
(2002, 25832, NULL,
sdo_elem_info_array (1,2,2),
sdo_ordinate_array(
500014,5650010,
500010,5650014,
500006,5650010)
) geom
FROM dual);
ORA-13285
Geometry coordinate transformation error
Cause: A coordinate pair was out of valid range for a conversion/projection.
Action: Check that data to be transformed is consistent with the desired conversion/projection.
The range of coordinates are valid IMO. This bug (?) exists in ORACLE 11.2.0.3 and 12.1.0.1.