修改sf下发欠单，bfm接收下发欠单，及处理发货单的关系

sf_stock/models/stock_backorder_confirmation.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+import json
+import requests
+from odoo import models, fields, api
+
+from odoo.exceptions import UserError
+import logging
+from odoo.tools import date_utils
+
+_logger = logging.getLogger(__name__)
+
+
+class StockBackorderConfirmation(models.TransientModel):
+    _inherit = 'stock.backorder.confirmation'
+
+    # 继承创建欠单
+    def process(self):
+        info = super(StockBackorderConfirmation, self).process()
+        _logger.info("创建欠单")
+        # 下发创建欠单到bfm
+
+        return info
+
+    # 继承取消创建欠单
+    def process_cancel_backorder(self):
+        info = super(StockBackorderConfirmation, self).process_cancel_backorder()
+        return info