protected function validateDecimalsCurrency()
    {
        $field = 'decimals';
        $value = $this->getSubmitted($field);

        if (!isset($value)) {
            $this->unsetSubmitted($field);
            return null;
        }

        if (preg_match('/^[0-2]+$/', $value) !== 1) {
            $this->setErrorInvalid($field, $this->translation->text('Decimals'));
            return false;
        }

        return true;
    }