title: Create constraint alter table invalid
body: <p>I had to modify an existing constraint so it would cascade updates and deletes.
  To do this I first removed the constraint and was planning on adding it (through an ALTER TABLE) but this fails.</p>
  
  <p>When I commit the query below it gives me the error '<code>ORA-01735: invalid ALTER TABLE option</code>':</p>
  
  <pre><code>ALTER TABLE 
      PARAM 
  ADD CONSTRAINT 
      FK_PARAM_PORTLET FOREIGN KEY (PORTLETID) 
  REFERENCES PORTLET(ID) 
  ON DELETE CASCADE ON UPDATE CASCADE;
  </code></pre>
  
  <p>Any idea what it could be? Am I overlooking something?</p>