Ich habe folgenden Code Ich möchte diese beiden Felderasset_catg_id undfolio_num. Diese sollten für viele zwei Felder verfügbar sein. Wie schreibe ich 2 _rec_name für eine einzelne Klasse?

class asset_asset(osv.osv):
    _inherit = "asset.asset"
    #_name = "asset_asset"
    _rec_name= "folio_num"
    #_rec_name = "assetmodelid_add"
    _columns = {
        'name': fields.char('Asset Name', size=64),
        'company_id1': fields.many2one('res.company', 'Substation', required=True),
        #'place1': fields.many2one('asset.parentlocation', 'Location'),
        'asset_catg_id' : fields.many2one('asset.catg', 'Asset Catg Selection',select=True, required=True),
            'area_id' : fields.many2one('asset.name', 'Asset Name Selection', domain="[('asset_catg_id', '=', asset_catg_id)]", select=True, required=True),
        'assetmodelid_add' : fields.many2one('agile.portfolio1','Asset Model Code',domain="[('area_id', '=', area_id)]",),
        'folio_num' : fields.char('Folio No',),
        'asse_line':fields.one2many('asset.line','emp_id','Name Plate'),
        'asse_line2':fields.one2many('asset.part','emp_id1','Parts'),
               #'assed_modelid':fields.many2one('agile.portfolio1','Asset Model ID',select=True, required=True),
        'quantity': fields.char('Quantity',size=64),
        'uom': fields.char('Uinit of Measure',size=64),
        'model_no' : fields.char('Model', size=64),

        #'asset_id':fields.many2one('agile.portfolio','Asset ID'),

    }