Web services ASMX WebService未从xmlns:ns1子名称空间获取请求值（xmlns:ns1问题）

我已经从提供的WSDL.xml文件中使用WSDL.exe实用程序生成了.NET 4.6 ASMX WebService

启动后，它显示了正确的（据我所知）用法示例：

POST/LSS3.asmx HTTP/1.1
主机：本地主机
内容类型：text/xml；字符集=utf-8
内容长度：长度
SOAPAction:“http://sap.com/xi/WebService/soap1.1"
一串
一串
一串
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但当我通过客户提供的请求文本使用谷歌邮递员进行测试时（他假设该文本必须在该服务中工作，并且没有其他方式…）

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一串
一串
一串

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WebService从不工作，它会崩溃并出现以下错误：

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soap：服务器
System.Web.Services.Protocols.SoapException:服务器无法处理请求。--System.NullReferenceException:对象链接为空或未指向对象。
同步绑定中的设备外部StockRequest。同步中的外部StockRequest（StoreBalancerRequest StoreBalancerRequest）
---跟踪结束---

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无法理解为什么在XML请求中看不到这些东西xmlns:ns1

请帮忙

POST /LSS3.asmx HTTP/1.1
Host: localhost
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://sap.com/xi/WebService/soap1.1"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <StoreBalanceRequest xmlns="urn:sibur:po:a:store:Balance">
      <Plant>string</Plant>
      <Material>string</Material>
      <PartyNumber>string</PartyNumber>
    </StoreBalanceRequest>
  </soap:Body>
</soap:Envelope>
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<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <ns1:StoreBalanceRequest xmlns:ns1="urn:sibur:po:a:store:Balance">
      <Plant>string</Plant>
      <Material>string</Material>
      <PartyNumber>string</PartyNumber>
    </ns1:StoreBalanceRequest>
  </soap:Body>
</soap:Envelope>

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <soap:Body>
        <soap:Fault>
            <faultcode>soap:Server</faultcode>
            <faultstring>System.Web.Services.Protocols.SoapException: Server was not available to process request. ---&gt; System.NullReferenceException: Object link is empty or doesnt point to an object.
   в SiburSevice.ExternalStockRequest_In_SyncBinding.ExternalStockRequest_In_Sync(StoreBalanceRequest StoreBalanceRequest)
   --- End of Trace ---</faultstring>
            <detail />
        </soap:Fault>
    </soap:Body>
</soap:Envelope>