alter table constraint fails

I am getting a ORA-00905 missing keyword

when I attempt to execute this sql

ALTER TABLE LI_ESTIMATES
 ADD CONSTRAINT XFK_EST_COST_ID FOREIGN KEY (EST_COST_ID)   REFERENCES LI_COST_CAT(EST_COST_ID)
  ON DELETE RESTRICT
  ON UPDATE RESTRICT Anyone see anything wrong with this?

Mike Received on Fri Sep 05 2003 - 15:50:56 CDT