Did you use DATAFILE instead of TEMPFILE while creating the TEMPORARY tablespace? As tycho as suggested already, if you want your TEMPORARY tablespace to be Locally Managed then you should use the TEMPFILE clause and NOT DATAFILE while creating the TEMPORARY TABLESPACE.

create temporary tablespace temp tempfile
'/u10/oradata/cprpt/temp01.dbf' size 250M reuse,
'/u10/oradata/cprpt/temp02.dbf' size 250M reuse,
'/u10/oradata/cprpt/temp03.dbf' size 250M reuse,
'/u10/oradata/cprpt/temp04.dbf' size 250M reuse
extent management local uniform size 3M;

-amar