diff --git a/yuthon_purchase/models/inherit_purchase_order.py b/yuthon_purchase/models/inherit_purchase_order.py
index c84e2672d..f65e08f3e 100644
--- a/yuthon_purchase/models/inherit_purchase_order.py
+++ b/yuthon_purchase/models/inherit_purchase_order.py
@@ -2,9 +2,9 @@
 from odoo import api, fields, models
 
 
-class YuthonPurchaseOrder(models.Model):
+class PurchaseOrder(models.Model):
     _name = 'purchase.order'
-    _inherit = 'purchase.order'
+    _inherit = ['purchase.order', 'soong.workflow.mixin']
 
     company_id = fields.Many2one('res.company', string="公司", default=lambda self: self.env.company)
     user_id = fields.Many2one('res.users', string="申请人", default=lambda self: self.env.user)
@@ -26,6 +26,6 @@ class PurchaseOrderPayLine(models.Model):
 
     purchase_id = fields.Many2one('purchase.order', string="关联采购单")
     payment_stage = fields.Char(string="付款阶段")
-    amount  = fields.Char(string="比例/金额")
+    amount = fields.Char(string="比例/金额")
     payment_date = fields.Date(string="付款日期")
     remake = fields.Char(string="条件")
\ No newline at end of file