SQL & PL/SQL

hi ,

Oracle 10.2.0.1.0
I'm getting error while creating a range partition to already existing table (method employed : partition swap method ) .
PF screen shot of error

SQL> ed
Wrote file afiedt.buf

  1  create table employee_details_temp partition by range (eid) (
  2  partition eid_1r values less than (1000)
  3  partition eid_2r values less than (20000)
  4  partition eid_3r values less than (40000)
  5  partition eid_3r values less than (maxvalue)
  6* )
SQL> /
partition eid_2r values less than (20000)
*
ERROR at line 3:
ORA-14020: this physical attribute may not be specified for a table partition

also ,

SQL> ed
Wrote file afiedt.buf

  1  create table employee_details_temp partition by range (eid) (
  2  partition eid_1r values less than (1000)
  3  partition eid_2r values less than (20000)
  4  partition eid_3r values less than (40000)
  5  partition eid_3r values less than (maxvalue)
  6  ) as select * from employee_details where 1=1;
  7* /
SQL> /
partition eid_2r values less than (20000)
*
ERROR at line 3:
ORA-14020: this physical attribute may not be specified for a table partition

please help .