使用SOAP从VBA调用Web服务

我正在尝试在Excel宏中调用Web服务:

Set objHTTP = New MSXML.XMLHTTPRequest
objHTTP.Open "post", "https://www.server.com/EIDEServer/EIDEService.asmx"
objHTTP.setRequestHeader "Content-Type", "text/xml"
objHTTP.setRequestHeader "SOAPAction", "PutSchedule"
objHTTP.send strXML      

我得到以下回复:

  
  
    
      
        soap:Client
        Server did not recognize the value of HTTP Header SOAPAction: PutSchedule.
        
      
    
   

以前有人做过这样的事吗？