diff --git a/addons/sale/models/sale_order_line.py b/addons/sale/models/sale_order_line.py
index e214b31b8a7..c92b1a507a1 100644
--- a/addons/sale/models/sale_order_line.py
+++ b/addons/sale/models/sale_order_line.py
@@ -282,7 +282,7 @@ class SaleOrderLine(models.Model):
     salesman_id = fields.Many2one(related='order_id.user_id', store=True, string='Salesperson', readonly=True)
     currency_id = fields.Many2one(related='order_id.currency_id', depends=['order_id.currency_id'], store=True, string='Currency', readonly=True)
     company_id = fields.Many2one(related='order_id.company_id', string='Company', store=True, readonly=True, index=True)
-    order_partner_id = fields.Many2one(related='order_id.partner_id', store=True, string='Customer', readonly=False)
+    order_partner_id = fields.Many2one(related='order_id.partner_id', store=True, string='Customer')
     analytic_tag_ids = fields.Many2many(
         'account.analytic.tag', string='Analytic Tags',
         domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]")