BUG #3636: createNativeQuery - don't work with INSERT INTO.

The following bug has been logged online:

Bug reference: 3636
Logged by: Michael "Zorkus" Antonov
Email address: olorinbant(at)gmail(dot)com
PostgreSQL version: 8.2.*
Operating system: Fedora Core 7, kernel 2.6.22.4-64.fc7, x86-32
Description: createNativeQuery - don't work with INSERT INTO.
Details:

When i doing query -
em.createNativeQuery(
"INSERT INTO contest_languages VALUES(?1 , ?2)"
).setParameter(1, contest.getContestId()).
setParameter(2 , la.getLanguageId()).
executeUpdate();

i receive this message -
Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2006.8 (Build
060830)): oracle.toplink.essentials.exceptions.DatabaseException
Internal Exception: org.postgresql.util.PSQLException: ERROR:
UNIQUE
"contest_languages_pkey"Error Code: 0
Call:INSERT INTO contest_languages VALUES(? , ?)
bind => [1, basic]
But i haven't this PK! and same query, mading from pgAdmin, work good. Why??