@@ -216,6 +216,10 @@ $GLOBALS['TL_DCA']['tl_vr_wa_reservation'] = array

             'eval'                    => array('rgxp' => 'datim', 'datepicker' => true, 'tl_class' => 'clr w50 wizard'),

             'sql'                     => "int(10) unsigned NOT NULL default '0'"

         ),

+        'checked_in_export_generated' => array

+        (

+            'sql'                     => "char(1) NOT NULL default ''"

+        ),

         'checked_in_nc_sent'      => array

         (

             'sql' => "int(10) unsigned NOT NULL default '0'"

@@ -83,6 +83,11 @@ class CheckInCompletedListener implements EventSubscriberInterface

      */

     private function generateCsvExport(array $reservationData, $reservationModel)

     {

+        // Do not execute if the export has already been generated

+        if ($reservationModel->checked_in_export_generated) {

+            return;

+        }

+

         // Create export directory if it doesn't exist

         $exportDir = $this->projectDir . '/export/check_in';

         $filesystem = new Filesystem();

@@ -294,5 +299,8 @@ class CheckInCompletedListener implements EventSubscriberInterface

             ),

             ['contao' => new ContaoContext(__METHOD__, 'CHECK_IN_CSV_EXPORT')]

         );

+

+        $reservationModel->checked_in_export_generated = '1';

+        $reservationModel->save();

     }

 }