// C# 소스 코드
        private static TrackRequest CreateTrackRequest()
        {
            TrackRequest request = new TrackRequest();
            request.WebAuthenticationDetail = new WebAuthenticationDetail();
            request.WebAuthenticationDetail.UserCredential = new WebAuthenticationCredential();
            request.WebAuthenticationDetail.UserCredential.Key = "CiX2k8x1RtuMwcds";
            request.ClientDetail = new ClientDetail();
            request.ClientDetail.AccountNumber = "510387348";
            request.ClientDetail.MeterNumber = "107531677";
            request.TransactionDetail = new TransactionDetail();
            request.TransactionDetail.CustomerTransactionId = "Track Request..."; 
            request.Version = new VersionId();

            request.SelectionDetails = new TrackSelectionDetail[1] { new TrackSelectionDetail() };
            request.SelectionDetails[0].PackageIdentifier = new TrackPackageIdentifier();
            request.SelectionDetai

ls[0].PackageIdentifier.Value = "XXX";
            request.SelectionDetails[0].PackageIdentifier.Type = TrackIdentifierType.TRACKING_NUMBER_OR_DOORTAG;

            return request;
        }

// 전환된 델파이 코드
procedure TForm1.btnTrackClick(Sender: TObject);
var
  rTrackRequest: TrackRequest;               
  rTrackReply: TrackReply;
  rTrackDetail: TrackSelectionDetail;

begin
  rTrackRequest := TrackRequest.Create;
  rTrackReply := TrackReply.Create;
  rTrackRequest.WebAuthenticationDetail := WebAuthenticationDetail.Create;
  rTrackRequest.WebAuthenticationDetail.UserCredential := webAuthenticationCredential.Create;
  rTrackRequest.WebAuthenticationDetail.UserCredential.Key := 'CiX2k8x1RtuMwcds';

  rtrackRequest.ClientDetail := ClientDetail.Create;
  rTrackRequest.ClientDetail.AccountNumber := '510387348';
  rTrackRequest.ClientDetail.MeterNumber := '107531677';
  rTrackRequest.TransactionDetail := TransactionDetail.Create;
  rTrackRequest.TransactionDetail.CustomerTransactionId := 'Track Request...';

  rTrackRequest.Version := VersionID.Create;

  rTrackRequest.SelectionDetails[0] := TrackSelectionDetail.Create;    // Access violation 에러가 나옴
  rTrackRequest.SelectionDetails[0].PackageIdentifier := TrackPackageIdentifier.Create;
  rTrackRequest.SelectionDetails[0].PackageIdentifier.Value := fldTrackNo.Text;
  rTrackRequest.SelectionDetails[0].PackageIdentifier.Type_ := TrackIdentifierType.TRACKING_NUMBER_OR_DOORTAG;
  rTrackReply := (FedEx as TrackPortType).track(rTrackRequest);
end;