Comment 17 for bug 992525

I answered my own question:

        As a result of the above, we have selected ``REPEATABLE READ`` as
        the default transaction isolation level for OpenERP cursors, as
        it will be mapped to the desired ``snapshot isolation`` level for
        all supported PostgreSQL version (8.3 - 9.x).

However, from the discussion above it seems misleading as to suggest openerp uses serializable level transaction isolation when in fact it does not