"jose soares" <jose(dot)soares(at)sferacarta(dot)com> writes:
> I found a strange behavior in my DB, I have a table which Pg isn't be able
> to update.
Maybe you've got a rule or trigger on the table that is interfering with
the update?
If there actually is a bug here, you've not provided nearly enough
information for anyone else to diagnose or reproduce it. Please see
http://wiki.postgresql.org/wiki/Guide_to_reporting_problems
for some help in composing useful bug reports.
regards, tom lane