Hello I'm using Openerp 7 when I do for loop I get

for z in a.res_lot_move_ids:
AttributeError: 'browse_record_list' object has no attribute 'res_lot_move_ids'

I do know that this is possible in odoo 8 an above, so can anyone give me a hint on how to make it work in OpenERP 7?

class SaleOrderLineLot(orm.Model):
    _name = 'rp.sale.order.line.lot'
def cancel_order_change_qty(self, cr, uid, line_id, context=None):
    lot_line_ids = self.search(cr,uid,[('sale_line_id', '=', line_id.id)], context=context)
    self.write(cr,uid,lot_line_ids,{'quantity': 0.0}, context)
    a = self.browse(cr, uid,lot_line_ids,context=context )
    for z in a.res_lot_move_ids:
        print "aa"
    return True

_columns = {
        'sale_line_id': fields.many2one('sale.order.line', 'Sale Order Line', ondelete='CASCADE'),
        'lot_id': fields.many2one('stock.production.lot', 'Lot'),
        'pack_id': fields.many2one('stock.tracking', 'Pack'),
        'location_id': fields.many2one('stock.location', 'Location'),
        'unit_price': fields.float('Unit Price', digits_compute=dp.get_precision('Unit Price')),
        'quantity': fields.float('Quantity', digits_compute=dp.get_precision('Product Unit of Measure')),
        'uom_id': fields.many2one('product.uom', 'Unit of Measure'),
        'total_price': fields.float('Total Price', digits_compute=dp.get_precision('Total Price')),
        'res_lot_move_ids': fields.many2many('stock.move', 'sale_order_lot_res_moves', 'lot_line_id', 'move_id',
                                             string='Reserved Moves'),
        'scrap_lot_move_ids': fields.many2many('stock.move', 'sale_order_lot_scrap_moves', 'lot_line_id', 'move_id',
                                               string='Scrapped Moves'),
    }

update: if I print a

I get

[browse_record(rp.sale.order.line.lot, 18881)]