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Selection Screens 上使用Subscreens，其实和以前的版本类似
直接上代码：
REPORT demo_sel_screen_as_subscreen.SELECTION-SCREEN BEGIN OF SCREEN 1100 AS SUBSCREEN NESTING LEVEL 4.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-010.
PARAMETERS: p1(10) TYPE c,p2(10) TYPE c,p3(10) TYPE c.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN END OF SCREEN 1100.SELECTION-SCREEN BEGIN OF SCREEN 1200 AS SUBSCREEN NESTING LEVEL 4.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME TITLE text-020.
PARAMETERS: q1(10) TYPE c OBLIGATORY,q2(10) TYPE c OBLIGATORY,q3(10) TYPE c OBLIGATORY.
SELECTION-SCREEN END OF BLOCK b2.
SELECTION-SCREEN END OF SCREEN 1200.DATA: ok_code TYPE sy-ucomm,save_ok TYPE sy-ucomm.DATA: number(4) TYPE n VALUE '1100'.START-OF-SELECTION.CALL SCREEN 100.MODULE status_0100 OUTPUT.SET PF-STATUS 'SCREEN_100'.
ENDMODULE.MODULE cancel INPUT.LEAVE PROGRAM.
ENDMODULE.MODULE user_command_0100 INPUT.save_ok = ok_code.CLEAR ok_code.CASE save_ok.WHEN 'BUTTON1'.number = 1100.WHEN 'BUTTON2'.number = 1200.ENDCASE.
ENDMODULE.AT SELECTION-SCREEN.MESSAGE s888(sabapdemos) WITH text-030 sy-dynnr.