oracle sequence not able to alter
my sequence is
CREATE SEQUENCE GRP_TRVL
  START WITH 533
  INCREMENT BY   1
  MAXVALUE 9999999999999999999999999999
  MINVALUE 1
  NOCYCLE
  NOCACHE
  NOORDER;
I need to change START WITH parameter.
alter sequence GRP_TRVL START WITH 1;
this is not working
pl hlep
thanks
ashwan