Why the multiple selection can't work in sub screen

Question

hi experts:
     when i try to use the sub-screen in the report,why the multiple selection function(SO_BCTXT) can't work normally in screen 1095:
the coding as below.will reward points if solve this issue
the main program in Subscreen:
PROCESS BEFORE OUTPUT.
module status_1005.
  CALL SUBSCREEN area INCLUDING sy-repid lv_tab_number.
PROCESS AFTER INPUT.
  MODULE cancel AT EXIT-COMMAND.
  CALL SUBSCREEN area.
  MODULE user_command_1005.
module user_command_1005 input.
  my_ok = ok_code.
  clear ok_code.
  case my_ok.
    when 'TAB1'.
      mytabstrip-activetab = my_ok .
      lv_tab_number = 1095.
    when 'TAB2'.
      mytabstrip-activetab = my_ok .
      lv_tab_number = 1096.
    when 'CRET' or 'ONLI'.
      perform get_bc_set
             using
                so_chanb[]
             changing
                <fs_bcsetfield> .
      leave to screen 0.
  endcase.
endmodule. 
in the screen 1095:
PROCESS BEFORE OUTPUT.
MODULE %_INIT_PBO_J.
MODULE %_PBO_REPORT.
MODULE %_PF_STATUS.
MODULE %_SO_BCTXT.
MODULE %_END_OF_PBO.
PROCESS AFTER INPUT.
MODULE %_INIT_PAI_J.
CHAIN.
  FIELD  SO_BCTXT-LOW.
  FIELD  SO_BCTXT-HIGH.
  MODULE %_SO_BCTXT.
ENDCHAIN.
FIELD !INCBCTY1 MODULE %_INCBCTY1 .
FIELD !INCBCTY2 MODULE %_INCBCTY2 .
FIELD !INCBCTY3 MODULE %_INCBCTY3 .
FIELD !INCBACT MODULE %_INCBACT .
FIELD !INCBINAC MODULE %_INCBINAC .
FIELD !INCLMAND MODULE %_INCLMAND .
FIELD !INCLOPTI MODULE %_INCLOPTI .
CHAIN.
  FIELD  SO_BCTXT-LOW.
  FIELD  SO_BCTXT-HIGH.
  FIELD INCBCTY1 .
  FIELD INCBCTY2 .
  FIELD INCBCTY3 .
  FIELD INCBACT .
  FIELD INCBINAC .
  FIELD INCLMAND .
  FIELD INCLOPTI .
  MODULE %_BLOCK_1095001.
ENDCHAIN.
CHAIN.
  FIELD  SO_BCTXT-LOW.
  FIELD  SO_BCTXT-HIGH.
  FIELD INCBCTY1 .
  FIELD INCBCTY2 .
  FIELD INCBCTY3 .
  FIELD INCBACT .
  FIELD INCBINAC .
  FIELD INCLMAND .
  FIELD INCLOPTI .
  MODULE %_END_OF_SCREEN.
  MODULE %_OK_CODE_1000.
ENDCHAIN.
in the main report
selection-screen begin of screen 1095 as subscreen.
enquire Data
data l_text       type as4text.
selection-screen begin of block b1 with frame title text-024.
select-options :
  so_bctxt     for l_text .
selection-screen skip 1 .
parameters:
  incbcty1    type c as checkbox default abap_true ,
  incbcty2    type c as checkbox default abap_true ,
  incbcty3    type c as checkbox default abap_true .
selection-screen skip 1 .
parameters:
  incbact      type c as checkbox default abap_true ,
  incbinac     type c as checkbox default abap_true .
selection-screen skip 1 .
parameters:
  inclmand     type c as checkbox default abap_true ,
  inclopti     type c as checkbox default abap_true .
selection-screen end of block b1.
selection-screen end of screen 1095 .

Answer 1

Hiii
    In main program you have dclared subscreen area.
now First of all you have to declare a selection screen in your main program
selection-screen begin of screen 1005 as subscreen.
SELECT-OPTIONS s_bukrs1 for  v_bukrs.   "whatever you want in selection screen
selection-screen end of screen 1005.
IN PBO of your main screen (not in 1005) write
call subscreen SUB1 including sy-repid '1005'.
where SUB1 is your subscreen area name. And remember don't touch PBO or PAI of your 1005 screen, otherwise it will give you error. Yuo can just put text in layout of 1005 screen. but don't disturb other things.