BUG #4051: ERROR: relation with OID xxxx does not exist

The following bug has been logged online:

Bug reference:      4051
Logged by:          N Jagan Mohan Rao
Email address:      n.jaganmohanrao@rediffmail.com
PostgreSQL version: 8.2.5
Operating system:   Window XP
Description:        ERROR: relation with OID xxxx does not exist
Details:

Here what i did:

I am using EntityManager, NativeQueries and deleting postgresql tables and
createing them dinamically(the schema is generated by using hybernate-tool).
till this point it is working fine .. and in the same transaction i am
putting some data and saving it through entitymanager and hence I am getting
the problem "ERROR: relation with OID xxxxxx does not exist" please give the
solution for this. I tried but I am unable to fix it.

If any one have the solution Help me its urgent...

Thanks in advance,
Jagan.