'invoice_number', 'text' => 'Rechnungsnummer', 'required' => true], ['key' => 'cinvoice_number', 'text' => 'Kundennummer', 'required' => true], ['key' => 'address1', 'text' => 'Adresse 1', 'required' => true], ['key' => 'address2', 'text' => 'Adresse 2', 'required' => true], ['key' => 'address3', 'text' => 'Adresse 3', 'required' => true], ['key' => 'address4', 'text' => 'Adresse 4', 'required' => true], ['key' => 'brutto_sum', 'text' => 'Brutto Summe', 'required' => true, 'table' => ['class' => 'text-right']], ['key' => 'fibu_number', 'text' => 'FIBU', 'required' => true], ['key' => 'date_outgoing', 'text' => 'Ausgangsdatum', 'required' => true], ]; }