state字段添加ondelete策略

jikimo_purchase_request/models/purchase_request.py

@@ -5,8 +5,11 @@ class PurchaseRequest(models.Model):
     _inherit = 'purchase.request'
     _description = '采购申请'
 
-    # 为state添加取消状态
-    state = fields.Selection(selection_add=[('cancel', '已取消')])
+     # 为state添加取消状态
+    state = fields.Selection(
+        selection_add=[('cancel', '已取消')],
+        ondelete={'cancel': 'set default'}  # 添加 ondelete 策略
+    )
 
 
 class PurchaseRequestLine(models.Model):