fix: prevent Odoo backend warnings by ensuring the returned dictionary contains a type key

models/pos_order.py

@@ -65,6 +65,10 @@ class PosOrder(models.Model):
         for order in self:
             order.message_post(body=f"<strong>Order Cancelled</strong> by <strong>{employee_name}</strong>")
             
+        # Prevent Odoo backend warning regarding custom action properties
+        if isinstance(res, dict) and 'type' not in res:
+            res['type'] = ''
+
         return res
 
     def _prepare_pos_log(self, body):