old_contents: # Copyright 2013-Today Odoo SA
  # Copyright 2016-2019 Chafique DELLI @ Akretion
  # Copyright 2018-2019 Tecnativa - Carlos Dauden
  # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
  
  from odoo import fields, models
  
  
  class InterCompanyRulesConfig(models.TransientModel):
  
      _inherit = 'res.config.settings'
  
      so_from_po = fields.Boolean(
          related='company_id.so_from_po',
          string="Create Sale Orders when buying to this company",
          help='Generate a Sale Order when a Purchase Order with this company '
          'as supplier is created.\n The intercompany user must at least be '
          'Sale User.',
      )
      sale_auto_validation = fields.Boolean(
          related='company_id.sale_auto_validation',
          string='Sale Orders Auto Validation',
          help='When a Sale Order is created by a multi company rule for '
               'this company, it will automatically validate it.',
      )
      warehouse_id = fields.Many2one(
          comodel_name='stock.warehouse',
          related='company_id.warehouse_id',
          string='Warehouse For Sale Orders',
          help='Default value to set on Sale Orders that will be created '
          'based on Purchase Orders made to this company.',
      )
      intercompany_user_id = fields.Many2one(
          comodel_name='res.users',
          related='company_id.intercompany_user_id',
          string='Intercompany User',
      )
  
new_contents: # Copyright 2013-Today Odoo SA
  # Copyright 2016-2019 Chafique DELLI @ Akretion
  # Copyright 2018-2019 Tecnativa - Carlos Dauden
  # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
  
  from odoo import fields, models
  
  
  class InterCompanyRulesConfig(models.TransientModel):
  
      _inherit = 'res.config.settings'
  
      so_from_po = fields.Boolean(
          related='company_id.so_from_po',
          string="Create Sale Orders when buying to this company",
          help='Generate a Sale Order when a Purchase Order with this company '
          'as supplier is created.\n The intercompany user must at least be '
          'Sale User.',
          readonly=False,
      )
      sale_auto_validation = fields.Boolean(
          related='company_id.sale_auto_validation',
          string='Sale Orders Auto Validation',
          help='When a Sale Order is created by a multi company rule for '
               'this company, it will automatically validate it.',
          readonly=False,
      )
      warehouse_id = fields.Many2one(
          comodel_name='stock.warehouse',
          related='company_id.warehouse_id',
          string='Warehouse For Sale Orders',
          help='Default value to set on Sale Orders that will be created '
          'based on Purchase Orders made to this company.',
          readonly=False,
      )
      intercompany_user_id = fields.Many2one(
          comodel_name='res.users',
          related='company_id.intercompany_user_id',
          string='Intercompany User',
          readonly=False,
      )
  
subject: set readonly = false for all res_config_settings fields