old_contents: #-*- coding:utf-8 -*-
  from openerp import models, fields
  
  
  class sale_order(models.Model):
      _inherit = "sale.order"
  
      project_id = fields.Many2one(states={})
  
new_contents: #-*- coding:utf-8 -*-
  from openerp import models, fields
  
  
  class sale_order(models.Model):
      _inherit = "sale.order"
  
      project_id = fields.Many2one(states={}, readonly=False)
  
subject: FIX contract editable