diff --git a/addons/fleet/data/mail_data.xml b/addons/fleet/data/mail_data.xml
index 0fb2cbc3c96..401f115b87b 100644
--- a/addons/fleet/data/mail_data.xml
+++ b/addons/fleet/data/mail_data.xml
@@ -5,6 +5,7 @@
             <field name="name">Contract to Renew</field>
             <field name="icon">fa-car</field>
             <field name="res_model_id" ref="fleet.model_fleet_vehicle_log_contract"/>
+            <field name="is_master_data">True</field>
         </record>
 
         <record id="mt_fleet_driver_updated" model="mail.message.subtype">
diff --git a/addons/hr_expense/data/mail_data.xml b/addons/hr_expense/data/mail_data.xml
index 735771fbff7..06c497b4176 100644
--- a/addons/hr_expense/data/mail_data.xml
+++ b/addons/hr_expense/data/mail_data.xml
@@ -6,6 +6,7 @@
             <field name="name">Expense Approval</field>
             <field name="icon">fa-dollar</field>
             <field name="res_model_id" ref="hr_expense.model_hr_expense_sheet"/>
+            <field name="is_master_data">True</field>
         </record>
 
         <!-- default alias for expenses -->
diff --git a/addons/hr_holidays/data/mail_data.xml b/addons/hr_holidays/data/mail_data.xml
index 253cac416fe..a57701e195c 100644
--- a/addons/hr_holidays/data/mail_data.xml
+++ b/addons/hr_holidays/data/mail_data.xml
@@ -6,11 +6,13 @@
             <field name="name">Time Off Approval</field>
             <field name="icon">fa-sun-o</field>
             <field name="res_model_id" ref="hr_holidays.model_hr_leave"/>
+            <field name="is_master_data">True</field>
         </record>
         <record id="mail_act_leave_second_approval" model="mail.activity.type">
             <field name="name">Time Off Second Approve</field>
             <field name="icon">fa-sun-o</field>
             <field name="res_model_id" ref="hr_holidays.model_hr_leave"/>
+            <field name="is_master_data">True</field>
         </record>
 
         <!-- Leave specific activities -->
@@ -18,11 +20,13 @@
             <field name="name">Allocation Approval</field>
             <field name="icon">fa-sun-o</field>
             <field name="res_model_id" ref="hr_holidays.model_hr_leave_allocation"/>
+            <field name="is_master_data">True</field>
         </record>
         <record id="mail_act_leave_allocation_second_approval" model="mail.activity.type">
             <field name="name">Allocation Second Approve</field>
             <field name="icon">fa-sun-o</field>
             <field name="res_model_id" ref="hr_holidays.model_hr_leave_allocation"/>
+            <field name="is_master_data">True</field>
         </record>
 
         <!-- Holidays-related subtypes for messaging / Chatter -->
diff --git a/addons/maintenance/data/mail_data.xml b/addons/maintenance/data/mail_data.xml
index dd80a831723..d298a0fb55d 100644
--- a/addons/maintenance/data/mail_data.xml
+++ b/addons/maintenance/data/mail_data.xml
@@ -6,6 +6,7 @@
         <field name="name">Maintenance Request</field>
         <field name="icon">fa-wrench</field>
         <field name="res_model_id" ref="maintenance.model_maintenance_request"/>
+        <field name="is_master_data">True</field>
     </record>
 
     <!-- email alias for maintenance requests -->
diff --git a/addons/product_expiry/data/product_expiry_data.xml b/addons/product_expiry/data/product_expiry_data.xml
index f0effeaaa77..62d95fb701f 100644
--- a/addons/product_expiry/data/product_expiry_data.xml
+++ b/addons/product_expiry/data/product_expiry_data.xml
@@ -10,6 +10,7 @@
             <field name="res_model_id" ref="stock.model_stock_production_lot"/>
             <field name="icon">fa-tasks</field>
             <field name="delay_count">0</field>
+            <field name="is_master_data">True</field>
         </record>
 </odoo>
 
diff --git a/addons/sale/data/mail_data.xml b/addons/sale/data/mail_data.xml
index 938a39e1576..50c42763b67 100644
--- a/addons/sale/data/mail_data.xml
+++ b/addons/sale/data/mail_data.xml
@@ -6,6 +6,7 @@
             <field name="name">Order Upsell</field>
             <field name="icon">fa-line-chart</field>
             <field name="res_model_id" ref="sale.model_sale_order"/>
+            <field name="is_master_data">True</field>
         </record>
 
         <!-- Sale-related subtypes for messaging / Chatter -->