* event handler for data retrieval
CALL METHOD application->get_message_list
  EXPORTING
    page     = page
  CHANGING
    mess_tab = mess_tab.

* Fllen der Tabellen mit DDIC-INfos:
* Variante (a): Index
field_label_itab = application->get_labels_zflug_input( page ).
* Variante (b): Key
field_label_itab2 = application->tab.
* Damit gleich zu Beginn was zum Auswhlen bei Abflugstadt steht
navigation->set_parameter( 'wa1-cityfrom' ).
CALL METHOD application->get_city_couples
  EXPORTING
    cityfrom     = wa1-cityfrom
  IMPORTING
    cityfrom_tab = cityfrom_tab
    cityto_tab   = cityto_tab.