Error returned is:"Client: Incorrect number parameters supplied for SOAP request
HRESULT = 0x80070057: The parameter is incorrect..."
Here is my code:

LOCAL loPrime2006WS AS "XML Web Service"
* LOCAL loPrime2006WS AS "MSSOAP.SoapClient30"
* Do not remove or alter following line. It is used to support IntelliSense for your XML Web service.
*__VFPWSDef__: loPrime2006WS = http://ourserver/oursite/Service.asmx?WSDL , Prime2006WS , Prime2006WSSoap
LOCAL loException, lcErrorMsg, loWSHandler
TRY
   loWSHandler = NEWOBJECT("WSHandler",IIF(VERSION(2)=0,"",HOME()+"FFC\")+"_ws3client.vcx")
   loPrime2006WS = loWSHandler.SetupClient("http://oursever/oursite.financesrvc/Service.asmx?WSDL", "Prime2006WS", "Prime2006WSSoap")
   * Call your XML Web service here.  ex: leResult = loPrime2006WS.SomeMethod()
   cxml = FILETOSTR("C:\cxml.txt")
   clogin = 'loginname' && <---Actual login substituted for this of course
   cpass = 'password'   && <---Actual password substituted for this of course
   loPrime = loPrime2006WS.CalcFinancing(clogin,cpass,cxml)
   *^^^^ Error occurs in line above
   IF TYPE('loPrime') = "O" .and. !ISNULL(loPrime)   
      =AMEMBERS(gaprops,loPrime,1)   && <-------- Problem here
      ********** loprime is an object, not null here but no props
      ********** gaprops does not exist here
      set STEP on
   ENDIF
   cresult = loPrime.document   && this property should exist but it does not
   IF !EMPTY(cresult)
      =MESSAGEBOX(cresult)
   ELSE
      =MESSAGEBOX('No results were returned.')
   ENDIF
   RELEASE loPrime2006WS
   RELEASE loWSHandler

CATCH TO loException
   lcErrorMsg="Error: "+TRANSFORM(loException.ERRORNO)+" - "+loException.MESSAGE
   DO CASE
      CASE VARTYPE(loPrime2006WS)#"O"
         * Handle SOAP error connecting to web service
      CASE !EMPTY(loPrime2006WS.FaultCode)
         * Handle SOAP error calling method
         lcErrorMsg=lcErrorMsg+CHR(13)+loPrime2006WS.DETAIL
      OTHERWISE
         * Handle other error
   ENDCASE
   * Use for debugging purposes
   MESSAGEBOX(lcErrorMsg)
FINALLY
ENDTRY

Here is the webservice service description:

 <?xml version="1.0" encoding="utf-8" ?> 
 <?xml version="1.0" encoding="utf-8" ?> 
- <wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" 
xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/"
 xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
 xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
 xmlns:tns="www.oursite.net/FinanceSrvc"
 xmlns:s="http://www.w3.org/2001/XMLSchema"
 xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"
 xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"
 targetNamespace="www.oursite.net/FinanceSrvc"
 xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
  <wsdl:documentation xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">Our
    Web Services</wsdl:documentation> 
- <wsdl:types>
- <s:schema elementFormDefault="qualified" targetNamespace="www.oursiteonline.net/FinanceSrvc">
- <s:element name="CalcFinancing">
- <s:complexType>
- <s:sequence>
  <s:element minOccurs="0" maxOccurs="1" name="LoginID" type="s:string" /> 
  <s:element minOccurs="0" maxOccurs="1" name="LoginPassword" type="s:string" /> 
  <s:element minOccurs="0" maxOccurs="1" name="aDoc" type="s:string" /> 
  </s:sequence>
  </s:complexType>
  </s:element>
- <s:element name="CalcFinancingResponse">
- <s:complexType>
- <s:sequence>
  <s:element minOccurs="0" maxOccurs="1" name="CalcFinancingResult" type="tns:TSrvcResponse" /> 
  </s:sequence>
  </s:complexType>
  </s:element>
- <s:complexType name="TSrvcResponse">
- <s:sequence>
  <s:element minOccurs="1" maxOccurs="1" name="Status" type="tns:TResponseStatus" /> 
  <s:element minOccurs="0" maxOccurs="1" name="Document" type="s:string" /> 
  </s:sequence>
  </s:complexType>
- <s:simpleType name="TResponseStatus">
- <s:restriction base="s:string">
  <s:enumeration value="sOK" /> 
  <s:enumeration value="sBusy" /> 
  <s:enumeration value="sFailed" /> 
  <s:enumeration value="sLoginFailed" /> 
  </s:restriction>
  </s:simpleType>