purchase_landed_costs: can't adapt type 'browse_record'

[Guewen Baconnier @ Camptocamp]

When confirming a purchase order with a fiscal position:

<snip>
  File "/srv/openerp/instances/openerp_test/parts/purchase-wkfl/purchase_landed_costs/purchase.py", line 624, in wkf_approve_order
    cr, uid, line_cost, context=context)
  File "/srv/openerp/instances/openerp_test/parts/purchase-wkfl/purchase_landed_costs/purchase.py", line 589, in _generate_invoice_from_landed_cost
    inv_id = invoice_obj.create(cr, uid, vals_inv, context=context)
  File "/srv/openerp/instances/openerp_test/parts/l10n_ch/l10n_ch_base_bank/invoice.py", line 122, in create
    return super(AccountInvoice, self).create(cursor, uid, vals, context=context)
  File "/srv/openerp/instances/openerp_test/parts/bank-statement-reconcile/account_invoice_reference/account_move.py", line 84, in create
    context=context)
  File "/srv/openerp/instances/openerp_test/parts/addons/mail/mail_thread.py", line 250, in create
    thread_id = super(mail_thread, self).create(cr, uid, values, context=context_operation)
  File "/srv/openerp/instances/openerp_test/parts/openerp-connector/connector/producer.py", line 42, in create
    record_id = create_original(self, cr, uid, vals, context=context)
  File "/srv/openerp/instances/openerp_test/parts/server/openerp/osv/orm.py", line 4490, in create
    cr.execute('insert into "'+self._table+'" (id'+upd0+") values ("+str(id_new)+upd1+')', tuple(upd2))
  File "/srv/openerp/instances/openerp_test/parts/server/openerp/sql_db.py", line 161, in wrapper
    return f(self, *args, **kwargs)
  File "/srv/openerp/instances/openerp_test/parts/server/openerp/sql_db.py", line 226, in execute
    res = self._obj.execute(query, params)
ProgrammingError: can't adapt type 'browse_record'