public function getDateToUseOptions()
    {
        return array(
            PluginConfig::InvoiceDate_InvoiceCreate => $this->t('option_dateToUse_1'),
            PluginConfig::InvoiceDate_OrderCreate => $this->t('option_dateToUse_2'),
            PluginConfig::InvoiceDate_Transfer => $this->t('option_dateToUse_3'),
        );
    }