You are hitting the "feature " number 3143531. See Metalink
note:3143531.8. According to that note, the solution is
simple: install the patchset 9.2.0.6 which will, according to
the tech. support, be available in "late October, early November ".
Another Oracle person who I occasionally exchange emails with
shrewdly observed that they didn 't specify the year.
Few weeks ago, I was blowing steam when I was told that my
problem at the time will ultimately be fixed in 9.2.0.6. and the =20
patchset was nowhere in sight.
Now, it is my greatest honor to pass the torch: it 's your turn
to swear and curse. Be a good cursor. Be ref cursor, if possible.