Job for deleting the Purchase Order from the Excel

static void Job39(Args _args)
{
    Dialog              _dialog;
    DialogField         _file;

    SysExcelApplication application;
    SysExcelWorkbooks workbooks;
    SysExcelWorkbook workbook;
    SysExcelWorksheets worksheets;
    SysExcelWorksheet worksheet;
    SysExcelCells cells;
    COMVariantType type;
   
    PurchTable       PurchTable;
    PurchLine        PurchLine;
    Name name;
    Filename filename;
    str journalName;
    str 50 POOrders;
   
    int row;
    ;

    row =1;
    application = SysExcelApplication::construct();
    workbooks = application.workbooks();
    //specify the file path that you want to read
    //Prompt to import excel
    _dialog = new Dialog("Please select the file to load");
    _dialog.addText("Select file:");
    _file =_dialog.addField(extendedTypeStr(FilenameOpen));
    _dialog.run();
    if (_dialog.closedOK())
    {
        filename = _file.value();
        try
        {
            workbooks.open(filename);
        }
        catch (Exception::Error)
        {
            throw error("File cannot be opened.");
        }

        workbook = workbooks.item(1);
        worksheets = workbook.worksheets();
        worksheet = worksheets.itemFromNum(1); //Here 3 is the worksheet Number
        cells = worksheet.cells();
        do
        {
            row++;
            POOrders                     = cells.item(row, 1).value().bStr();
           
             ttsBegin;
     select  forUpdate PurchTable  where PurchTable.PurchId== POOrders;//"000013";
    {
       
        while select  forUpdate PurchLine  where PurchLine.PurchId == PurchTable.PurchId
        {
           
            PurchLine.doDelete();
        }
        PurchTable.doDelete();
       
    }
       ttsCommit;
           
            // Loads the next row into the variant type and validating that its is empty or not
            type = cells.item(row+1, 1).value().variantType();
        }
        while (type != COMVariantType::VT_EMPTY);
        application.quit();
    }



}