If the user selects the pushbutton on the selection screen, the runtime environment triggers the event AT SELECTION-SCREEN and the function code fcode is transferred to the ucomm component in the interface work area sscrfields.
他觸發的是 AT SELECTION-SCREEN這個事件
AT USER-COMMAND.
Effect
This statement defines an event block whose event is triggered by the ABAP runtime environment if, during the display of a screen list, a function with a self-defined function
code was chosen.
這個是需要壹個自定義的function code來觸發的
也就是 SET PF-STATUS 'MYLIST' guistatus裏面的function code