See if you can use Rick's wwSoap class http://www.west-wind.com/wwSOAP.asp

>The following code is JScript that use SSRS Web Service:
>SoapHeaderAttribute("ServerInfoHeaderValue", Direction=SoapHeaderDirection.Out)
>SoapDocumentMethodAttribute("http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices/GetReportParameters", RequestNamespace="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices", ResponseNamespace="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices", Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Wrapped)
>public function GetReportParameters (
> Report : String,
> HistoryID : String,
> ForRendering : boolean,
> Values : ParameterValue[],
> Credentials : DataSourceCredentials[]
>) : ReportParameter
>
>Can someone please guide me how to use this WS from VFP?
>
>TIA