diff --git a/addons/point_of_sale/models/pos_config.py b/addons/point_of_sale/models/pos_config.py
index 99b30f6b38a..fde7cc69678 100644
--- a/addons/point_of_sale/models/pos_config.py
+++ b/addons/point_of_sale/models/pos_config.py
@@ -111,7 +111,8 @@ class PosConfig(models.Model):
         'account.journal', string='Sales Journal',
         domain=[('type', '=', 'sale')],
         help="Accounting journal used to post sales entries.",
-        default=_default_sale_journal)
+        default=_default_sale_journal,
+        ondelete='restrict')
     invoice_journal_id = fields.Many2one(
         'account.journal', string='Invoice Journal',
         domain=[('type', '=', 'sale')],
diff --git a/addons/point_of_sale/models/pos_order.py b/addons/point_of_sale/models/pos_order.py
index 7b2157c68ba..8642bdd2f4c 100644
--- a/addons/point_of_sale/models/pos_order.py
+++ b/addons/point_of_sale/models/pos_order.py
@@ -246,7 +246,7 @@ class PosOrder(models.Model):
     note = fields.Text(string='Internal Notes')
     nb_print = fields.Integer(string='Number of Print', readonly=True, copy=False, default=0)
     pos_reference = fields.Char(string='Receipt Number', readonly=True, copy=False)
-    sale_journal = fields.Many2one('account.journal', related='session_id.config_id.journal_id', string='Sales Journal', store=True, readonly=True)
+    sale_journal = fields.Many2one('account.journal', related='session_id.config_id.journal_id', string='Sales Journal', store=True, readonly=True, ondelete='restrict')
     fiscal_position_id = fields.Many2one(
         comodel_name='account.fiscal.position', string='Fiscal Position',
         readonly=True,