I've imported some wsdl for a project. i want to change the SoapRequest on HttpRio onBeforeExecute event, but as i changed the request, im getting some errors how can i change the request xml file with stringReplace function on this event.

i've tried to change the size of stream, i ve changed the encoding etc. but anyway it didnt work.

example

procedure TForm1.RiomBeforeExecute(const MethodName: string; SOAPRequest: TStream);
var
  sTmp                                  : TStringList;

begin

  sTmp:=TStringList.Create;
  SOAPRequest.Position := 0;
  sTmp.LoadFromStream(SOAPRequest);
  sTmp.Text := StringReplace(sTmp.Text,'blablaa','bla',[RfReplaceAll]);
  sTmp.SaveToStream(SOAPRequest);
  // blaa blaa...
end;