某些Acumatica实例的SOAP登录错误

您好，我有一个C#工具，可以将数据导入Acumatica中的一个自定义表单。它登录到URL并批量导入数据。它在大多数情况下工作正常，但我们遇到了一个无法访问其实例的客户端。我可以在浏览器中调用他们的asmx页面，一切看起来都很好，但当程序调用Login时，我们遇到了一个奇怪的错误

 Exception thrown: 'System.Web.Services.Protocols.SoapException' in System.Web.Services.dll
An unhandled exception of type 'System.Web.Services.Protocols.SoapException' occurred in System.Web.Services.dll
System.Web.Services.Protocols.SoapException: The request element <Login xmlns='http://www.acumatica.com/typed/'> was not recognized.
   at System.Web.Services.Protocols.Soap11ServerProtocolHelper.RouteRequest()
   at System.Web.Services.Protocols.SoapServerProtocol.Initialize()
   at System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing)

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您是否能够使用工具->Web服务查看该实例的服务及其wsdl？是的，看起来不错。

_itemsScreen = new VendorItem.Screen();
        _itemsScreen.Url = url + "/Soap/SW200014.asmx";
        _itemsScreen.EnableDecompression = true;
        _itemsScreen.CookieContainer = new System.Net.CookieContainer();
        _itemsScreen.Timeout = 3600000;
        _itemsScreen.Login(username, password);