Sales, Sales Quotation, Purch Totals by code

  this.SAZTotalAmount = SalesTotals_Sales::construct(_salesTable, SalesUpdate::All).totalAmount();

  PurchTotals purchTotals = PurchTotals::newPurchTable(_purchTable);
        purchTotals.calc();

 SalesQuotationTotals salesQuotationTotals = SalesQuotationTotals::construct(_salesQuotationTable);
        salesQuotationTotals.calc();