old_contents: # -*- coding: utf-8 -*-
  # Copyright 2015-2017 Eficent Business and IT Consulting Services S.L.
  # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
  from odoo import fields, models
  
  
  class AccountMoveLine(models.Model):
      _inherit = 'account.move.line'
  
      aging_comments = fields.Text(string='Aging comments')
  
new_contents: # -*- coding: utf-8 -*-
  # Copyright 2015-2017 Eficent Business and IT Consulting Services S.L.
  # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
  from odoo import fields, models
  
  
  class AccountMoveLine(models.Model):
      _inherit = 'account.move.line'
  
      aging_comments = fields.Text()
  
subject: remove string in text field