php通过soapclient连接SAP的ws，错误提示找不到支持的xstream

最近项目需要从SAP捞资料，对方给出了webservice，由于是第一次连，问题多多，特来请教！

function如下：

• array(1) {
• [0]=>
• string(80) "ZzMmStockInquireResponse ZzMmStockInquire(ZzMmStockInquire $parameters)"
• }

type如下：

• string(269) "struct ZzMmStockInquire {
• TableOfRangeSLgortD LgortTi;
• TableOfRangeSMatnr MatnrTi;
• char1 NonzerostockI;
• char1 Nospec2I;
• char1 SobkzeI;
• char1 SobkzitI;
• char1 SobkzmkI;
• char1 SobkznI;
• char1 SobkzoI;
• TableOfZzsmmStock StockT;
• TableOfRangeSWerks WerksTi;
• }"

php代码如下：

 header("Content-Type: text/html;charset=utf-8");
  $user = '123';
  $password = '###';
  $wsdl = 'http://sapqss.test.com:8000/sap/bc/srt/wsdl/bng56231/wsdl11/allinone/ws_policy/document?sap-client=230';
 $SOAP_CONFIG = array(
          login' => $user,
         'password' => $password,
          'trace' =>true,
          'soap_version'=>SOAP_1_2,
          'connection_timeout' => 50,
          'encoding' => 'UTF-8',
          'cache_wsdl' => WSDL_CACHE_NONE,
          'keep_alive' => false
      );
     try {
                  $client = new SoapClient($wsdl, $SOAP_CONFIG); //调用sap里的接口
     } catch (Exception $e) {
                  print $e->getMessage();
      }

运行之后，页面出现如下的错误，请问是什么造成的呢？

• Fatal error: Uncaught SoapFault exception: [soap-env:Server] SRT: Unsupported xstream found: ("HTTP Code 200 : OK") in C:\wamp\www\test\sap_ws\demo2.php:48