How to properly print sales/return receipts in JavaPOS?

Question

Java

At the moment I am trying to get the java module to work, which works with the PIRIT K fiscal registrar.
The work is done through javaPOS.
Current issues:
Sale.

FiscalPrinter printer = new FiscalPrinter();
        printer.open("PIRIT");
        printer.claim(1);
        printer.beginFiscalReceipt(true);
        printer.printRecItem(premadeString("Тестовый товар"), 2, 1 * 1000, 2, 1, premadeString("Тестовый"));
        printer.printRecTotal(2, 100, "0");
        printer.printRecVoid("Закрыли чек");

The problem is that VAT is not printed on the check, although the dimensions are filled in the printer and I indicate the number when selling.
Return

FiscalPrinter printer = new FiscalPrinter();
        printer.open("PIRIT");
        printer.claim(1);
        printer.setFiscalReceiptType(FPTR_RT_REFUND); 
        printer.beginFiscalReceipt(true);
        printer.printRecRefund("Тестовый возврат", 1, 2);
        printer.printRecVoid("Закрыли чек");

The return doesn't work at all. I get error value of station. Those. the printer is in the wrong state.
printRecIntemRefund operations are not supported by the driver.