Added second class to debug 1:n relation, which is working in general

src/admin/common/models/factory/club.php

@@ -16,7 +16,7 @@ class CommonClubsModelFactoryClub extends AbstractCommonClubsModelFactory
             'iban'=>array(),
             'bic'=>array(),
             'charitable'=>array('type'=>'int'),
-            'president'=>array('type'=>'int', 'ref'=>'CommonClubsModelUser')
+            'president'=>array('type'=>'ref', 'ref'=>'CommonClubsModelUser')
         );
     }