Validation of selection screen can be performed in the AT SELECTION
SCREEN event.
Example:
************************************************************************ * AT
SELECTION
SCREEN
* ************************************************************************
at selection-screen.
perform validate_selection_screen using g_returkode.
if g_returkode = c_returkode_error.
exit.
endif.
*&---------------------------------------------------------------------* *&
Form validate_selection_screen *&---------------------------------------------------------------------* *
Validation of selection screen *----------------------------------------------------------------------* *
-->P_G_RETURKODE text *----------------------------------------------------------------------*
form validate_selection_screen using
p_returkode.
if s_framd > 12 or s_framd < 1 or s_tilmd > 12 or
s_tilmd < 1.
message e998.
p_returkode = c_returkode_error.
exit.
endif.
if s_framd > s_tilmd.
message e997.
p_returkode = c_returkode_error.
exit.
endif.