diff --git a/yuthon_hr_employee_approval/models/yuthon_retired_approval.py b/yuthon_hr_employee_approval/models/yuthon_retired_approval.py
index 5b9e9272d..5fd27c33f 100644
--- a/yuthon_hr_employee_approval/models/yuthon_retired_approval.py
+++ b/yuthon_hr_employee_approval/models/yuthon_retired_approval.py
@@ -5,6 +5,7 @@ from odoo.exceptions import UserError
 class YuthonRetiredApproval(models.Model):
     _name = 'yuthon.retired.approval'
     _description = '退休申请表'
+    _inherit = ['soong.workflow.mixin', 'mail.thread.main.attachment', 'mail.activity.mixin']
 
     name = fields.Char(string='标题')
     text = fields.Text(string='正文')