diff --git a/purchase_usability/purchase.py b/purchase_usability/purchase.py
index c6489bc..a4fa576 100644
--- a/purchase_usability/purchase.py
+++ b/purchase_usability/purchase.py
@@ -16,6 +16,8 @@ class PurchaseOrder(models.Model):
     fiscal_position_id = fields.Many2one(track_visibility='onchange')
     incoterm_id = fields.Many2one(track_visibility='onchange')
     partner_ref = fields.Char(track_visibility='onchange')
+    # field 'partner_id': native value for track_visibility='always'
+    partner_id = fields.Many2one(track_visibility='onchange')
     # for report
     delivery_partner_id = fields.Many2one(
         'res.partner', compute='_compute_delivery_partner_id', readonly=True)
diff --git a/purchase_usability/purchase_view.xml b/purchase_usability/purchase_view.xml
index 3dad04d..802694c 100644
--- a/purchase_usability/purchase_view.xml
+++ b/purchase_usability/purchase_view.xml
@@ -33,6 +33,9 @@
         <field name="fiscal_position_id" position="attributes">
             <attribute name="widget">selection</attribute>
         </field>
+        <button name="button_cancel" type="object" position="attributes">
+            <attribute name="confirm">Are you sure you want to cancel this purchase order?</attribute>
+        </button>
     </field>
 </record>
 
diff --git a/sale_usability/sale_view.xml b/sale_usability/sale_view.xml
index 7509c3d..f17ef02 100644
--- a/sale_usability/sale_view.xml
+++ b/sale_usability/sale_view.xml
@@ -24,6 +24,9 @@
             <attribute name="context">{'show_address': 1, 'default_type': 'delivery'}</attribute>
             <attribute name="options">{'always_reload': True}</attribute>
         </field>
+        <button name="action_cancel" type="object" position="attributes">
+            <attribute name="confirm">Are you sure you want to cancel this sale order?</attribute>
+        </button>
     </field>
 </record>
 
diff --git a/stock_usability/stock_view.xml b/stock_usability/stock_view.xml
index 4c1f998..77f699f 100644
--- a/stock_usability/stock_view.xml
+++ b/stock_usability/stock_view.xml
@@ -29,6 +29,9 @@
             <attribute name="attrs"></attribute>
         </page>
         -->
+        <button name="action_cancel" type="object" position="attributes">
+            <attribute name="confirm">Are you sure you want to cancel this picking?</attribute>
+        </button>
     </field>
 </record>