ODBC Failure

Dear all,

I am writing VB5 to open the ODBC sources to the server which has Postgres 6.2 ! I want to do the update records in the
ODBC.But it dose not allowed me to do so and an error message is generated says, 

Can't Update,Database object is not updatable

I have check the recordset, it is a dynaset !!'

So do any of u can help ?

THANKS !!!!

regards,
MICHAEL