Solved: Referential contstraint in On-Line 7

I posted a question about foreign key constraint in on-line 7 yesterday. It turns out Informix does support cascading deletion. But the problem is, the foreig key constraint created through dbaccess can't turn the cascading detele option on. When I created the constraint I set this option to "Yes", but when I go back to it, the "CD" column is set to "N". I have to run a " ALTER TABLE .... ON DELETE CASCADE". This will set cascading delete on. So seems there is a bug there. Thanks for those precious replies. Weimin