protected function getForeignVatOptions()
    {
        return array(
            PluginConfig::ForeignVat_Both => $this->t('option_foreignVat_1'),
            PluginConfig::ForeignVat_No => $this->t('option_foreignVat_2'),
            PluginConfig::ForeignVat_Only => $this->t('option_foreignVat_3'),
        );
    }