def get_object_reference(self, cr, uid, module, xml_id):

    """Returns (model, res_id) corresponding to a given module and xml_id (cached) or raise ValueError if not found"""

    return self.xmlid_lookup(cr, uid, "%s.%s" % (module, xml_id))[1:3]

# NEW V8 API

    @tools.ormcache(skiparg=3)

    def xmlid_lookup(self, cr, uid, xmlid):

        """Low level xmlid lookup

        Return (id, res_model, res_id) or raise ValueError if not found

        """

        module, name = xmlid.split('.', 1)

        ids = self.search(cr, uid, [('module','=',module), ('name','=', name)])

        if not ids:

            raise ValueError('External ID not found in the system: %s' % (xmlid))

        # the sql constraints ensure us we have only one result

        res = self.read(cr, uid, ids[0], ['model', 'res_id'])

        if not res['res_id']:

            raise ValueError('External ID not found in the system: %s' % (xmlid))

        return ids[0], res['model'], res['res_id']

@api.multi

    def popup_wizard( self ):

        if self._context is None:

            self._context = {}

        ir_model_data = self.env['ir.model.data']

        try:

            compose_form_id = ir_model_data.get_object_reference( 'ir_export_extended_ept', 'export_wizard_view_ept' )[1]

        except ValueError:

            compose_form_id = False

        return {

            'name': _( 'Export File' ),

            'res_model': 'export.wizard.ept',

            'type': 'ir.actions.act_window',

            'view_id': compose_form_id,

            'view_mode': 'form',

            'view_type': 'form',

            'target': 'new',

        }