Return to selection screen

Hello,

In the program i am writing now, I intended to have the program return back to the selection screen whenever I encountered an error and the user pressed the green tick on the pop up box for the error message. However, what happens to me right now is that all I have is a blank screen with SAP on the title area if I do, for example,

MESSAGE e161(q6) WITH wa_defn-fieldname 'System'.

May I know how can I accomplish that? Thanks!

Regards,

Anyi