diff --git a/addons/purchase_stock/models/purchase.py b/addons/purchase_stock/models/purchase.py
index 80f9e7d8339..572b5c0a8c2 100644
--- a/addons/purchase_stock/models/purchase.py
+++ b/addons/purchase_stock/models/purchase.py
@@ -304,7 +304,7 @@ class PurchaseOrderLine(models.Model):
                     # If the quantity is now below the invoiced quantity, create an activity on the vendor bill
                     # inviting the user to create a refund.
                     activity = self.env['mail.activity'].sudo().create({
-                        'activity_type_id': self.env.ref('mail.mail_activity_data_todo').id,
+                        'activity_type_id': self.env.ref('mail.mail_activity_data_warning').id,
                         'note': _('The quantities on your purchase order indicate less than billed. You should ask for a refund. '),
                         'res_id': line.invoice_lines[0].invoice_id.id,
                         'res_model_id': self.env.ref('account.model_account_move').id,
diff --git a/addons/stock/models/stock_rule.py b/addons/stock/models/stock_rule.py
index 76e0927c738..77893af9a81 100644
--- a/addons/stock/models/stock_rule.py
+++ b/addons/stock/models/stock_rule.py
@@ -289,9 +289,9 @@ class StockRule(models.Model):
         existing_activity = self.env['mail.activity'].search([('res_id', '=',  product_id.product_tmpl_id.id), ('res_model_id', '=', self.env.ref('product.model_product_template').id),
                                                               ('note', '=', note)])
         if not existing_activity:
-            # If the user deleted todo activity type.
+            # If the user deleted warning activity type.
             try:
-                activity_type_id = self.env.ref('mail.mail_activity_data_todo').id
+                activity_type_id = self.env.ref('mail.mail_activity_data_warning').id
             except:
                 activity_type_id = False
             self.env['mail.activity'].create({