Then try like this
TABLES : ekpo.
SELECT-OPTIONS : s_ebeln FOR ekpo-ebeln.
at SELECTION-SCREENon s_ebeln.
if s_ebeln isINITIAL.
CALLFUNCTION'POPUP_TO_DISPLAY_TEXT'
EXPORTING
* TITEL = ' '
textline1 = 'Enter Data'.
* TEXTLINE2 = ' '
* START_COLUMN = 25
* START_ROW = 6
.
endif.
