REPORT ztest.
PARAMETERS: p_field1 TYPE char10,
p_field2 TYPE char10,
p_field3 TYPE char10,
p_field4 TYPE char10.
AT SELECTION-SCREEN.
IF p_field1 IS INITIAL.
MESSAGE 'Please enter a value in Field1.' TYPE 'E'.
ENDIF.
OUTPUT:
On pressing “ENTER” button or executing the program (F8):
At Selection-Screen On <field> and At Selection-Screen events, both do the same job i.e. validating the input fields present on the selection screen. The only difference is At Selection-screen event is used to validate all the fields on the selection screen where as At Selection-Screen On <field> event is used to validate a particular field in the selection screen.
