protected function _validateOldDebitInfo($debitInfo)
    {
        $stringHelper = getStr();
        $debitInfo = $this->_fixAccountNumber($debitInfo);

        $validationResult = true;

        if (!$stringHelper->preg_match("/^\d{5,8}$/", $debitInfo['lsblz'])) {
            // Bank code is invalid
            $validationResult = self::INVALID_BANK_CODE;
        }

        if (true === $validationResult && !$stringHelper->preg_match("/^\d{10,12}$/", $debitInfo['lsktonr'])) {
            // Account number is invalid
            $validationResult = self::INVALID_ACCOUNT_NUMBER;
        }


        return $validationResult;
    }