How to capture values dynamically from output screen

Hi all,
I have a new requirement.
i developed a report which is showing output correctly. Here i have to take a check box for every record in output screen. if i check some of the check boxs then it should allow for further processing.
i succeeded upto put checkboxes on output screen.
but i don't know how to capture the values of checkboxes of every record into an internal table. it is necessary to capture into an internal table
will it be work by using LOOP AT SCREEN statement.
could you please explain with examples. it is normal report program only.
i would appreciate an early reply
Regards
Prabhakar

Sample code for usage:
Internal table for Region and its Description
  data: begin of t_t005u occurs 0,
         LAND1 like t005u-land1,
         BLAND like t005u-bland,
         Bezei like t005u-bezei,
        end of t_t005u.
Ranges for Country
  ranges: r_land1 for t005u-land1.
Get the country codes and their descriptions
    refresh r_land1.
    clear r_land1.
  refresh t_dynpfields.
  move 'V_LAND1' to t_dynpfields-fieldname.
  append t_dynpfields.
  clear t_dynpfields.
Read the value in the Country field on the screen
  call function 'DYNP_VALUES_READ'
    EXPORTING
      dyname               = 'SAPLZ_VENDOR_MASTER'
      dynumb               = '0004'
      translate_to_upper   = 'X'
    TABLES
      dynpfields           = t_dynpfields
    EXCEPTIONS
      invalid_abapworkarea = 01
      invalid_dynprofield  = 02
      invalid_dynproname   = 03
      invalid_dynpronummer = 04
      invalid_request      = 05
      no_fielddescription  = 06
      undefind_error       = 07.
  read table t_dynpfields with key fieldname = 'V_LAND1'.
  if not t_dynpfields-FIELDVALUE is initial.
    r_land1-low = t_dynpfields-FIELDVALUE.
    r_land1-sign = 'I'.
    r_land1-option = 'EQ'.
    append r_land1.
    clear r_land1.
  endif.
Get the Regions to be displayed as F4 Help
  select land1
         bland
         bezei
    from t005u
    into table t_t005u
   where spras = 'EN'
     and land1 in r_land1.
  if not t_t005u[] is initial..
Popup to display Valid Regions for the selected country
    CALL FUNCTION 'POPUP_WITH_TABLE_DISPLAY'
      EXPORTING
        ENDPOS_COL   = 60
        ENDPOS_ROW   = 40
        STARTPOS_COL = 40
        STARTPOS_ROW = 20
        TITLETEXT    = 'Region'
      IMPORTING
        CHOISE       = v_choice
      TABLES
        VALUETAB     = t_t005u
      EXCEPTIONS
        BREAK_OFF    = 1
        OTHERS       = 2.
    if sy-subrc = 0.
      if v_activity = 'V'.
        read table t_t005u index v_choice.
        if sy-subrc = 0.
          v_regio = t_t005u-bland.
          move 'V_BEZEI' to t_dynpfields-fieldname.
          move t_t005u-bezei to t_dynpfields-fieldvalue.
          append t_dynpfields.
Update the Region description on the screen.
          call function 'DYNP_VALUES_UPDATE'
            EXPORTING
              dyname               = 'SAPLZ_VENDOR_MASTER'
              dynumb               = '0004'
            TABLES
              dynpfields           = t_dynpfields
            EXCEPTIONS
              invalid_abapworkarea = 01
              invalid_dynprofield  = 02
              invalid_dynproname   = 03
              invalid_dynpronummer = 04
              invalid_request      = 05
              no_fielddescription  = 06
              undefind_error       = 07.
        endif.
      endif.
    endif.
  endif.

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            qmnum TYPE qmnum,
            END OF ty_qmur,
            BEGIN OF ty_iloa,
            tplnr TYPE tplnr,
            iloan TYPE iloan,
            END OF ty_iloa,
            BEGIN OF ty_output,
            qmnum TYPE qmnum,
            equnr TYPE equnr,
           iloan TYPE iloan,
            ausvn TYPE ausvn,
            ausbs TYPE ausbs,
            auztv TYPE auztv,
            auztb TYPE auztb,
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            priok TYPE priok,
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            vkorg TYPE vkorg,
            vtweg TYPE vtweg,
            spart TYPE spart,
            parnr TYPE i_parnr,
            parvw TYPE parvw,
            arbpl TYPE arbpl,
           objid TYPE cr_objid,
           arbpl1 TYPE arbpl,
            ktext TYPE cr_ktext,
            fecod TYPE fecod,
            fegrp TYPE fegrp,
            urcod TYPE urcod,
            urgrp TYPE urgrp,
            urtxt TYPE urstx,
            tplnr TYPE tplnr,
            END OF ty_output.
    DATA : it_qmih TYPE STANDARD TABLE OF ty_qmih,
           it_qmel TYPE STANDARD TABLE OF ty_qmel,
           it_ihpa TYPE STANDARD TABLE OF ty_ihpa,
           it_crhd TYPE STANDARD TABLE OF ty_crhd,
           it_crtx TYPE STANDARD TABLE OF ty_crtx,
           it_qmfe TYPE STANDARD TABLE OF ty_qmfe,
           it_qmur TYPE STANDARD TABLE OF ty_qmur,
           it_iloa TYPE STANDARD TABLE OF ty_iloa,
           it_output TYPE STANDARD TABLE OF ty_output,
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           wa_qmur TYPE ty_qmur,
           wa_iloa TYPE ty_iloa,
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                it_ihpa,
                it_crhd,
                it_crtx,
                it_qmfe,
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                 wa_crtx,
                 wa_qmfe,
                 wa_qmur,
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                 wa_output.
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              equnr
              iloan
              ausvn
              ausbs
              auztv
              auztb
              iwerk
              FROM qmih
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               qmtxt
               indtx
               priok
               strmn
               strur
               ltrmn
               ltrur
               objnr
               arbpl
               vkorg
               vtweg
               spart
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               INTO TABLE it_qmel
               FOR ALL ENTRIES IN it_qmih
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                                                         indtx
                                                         strmn
                                                         strur
                                                         ltrmn
                                                         ltrur
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                                                         arbpl
                                                         vkorg
                                                         vtweg
                                                         spart.
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               parvw
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                                                         objnr.
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               objid
               FROM crhd
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               FOR ALL ENTRIES IN it_qmel
               WHERE objid = it_qmel-arbpl.
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                                                        objid.
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               fegrp
               qmnum
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               WHERE qmnum = it_qmih-qmnum.
      ENDIF.
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               fegrp.
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               urtxt
               qmnum
               FROM qmur
               INTO TABLE it_qmur
               FOR ALL ENTRIES IN it_qmih
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      ENDIF.
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                                                         urtxt.
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                iloan
                FROM iloa
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                WHERE iloan = it_qmih-iloan.
      ENDIF.
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                                                        iloan.
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        wa_output-qmnum = wa_qmih-qmnum.
        wa_output-equnr = wa_qmih-equnr.
       wa_output-iloan = wa_qmih-iloan.
        wa_output-ausvn = wa_qmih-ausvn.
        wa_output-ausbs = wa_qmih-ausbs.
        wa_output-auztv = wa_qmih-auztv.
        wa_output-auztb = wa_qmih-auztb.
        wa_output-iwerk = wa_qmih-iwerk.
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        CLEAR wa_output.
        READ TABLE it_qmel INTO wa_qmel WITH KEY qmnum = wa_qmih-qmnum.
        wa_output-qmtxt = wa_qmel-qmtxt.
        wa_output-indtx = wa_qmel-indtx.
        wa_output-priok = wa_qmel-priok.
        wa_output-strmn = wa_qmel-strmn.
        wa_output-strur = wa_qmel-strur.
        wa_output-ltrmn = wa_qmel-ltrmn.
        wa_output-ltrur = wa_qmel-ltrur.
       wa_output-objnr = wa_qmel-objnr.
       wa_output-arbpl = wa_qmel-arbpl.
        wa_output-vkorg = wa_qmel-vkorg.
        wa_output-vtweg = wa_qmel-vtweg.
        wa_output-spart = wa_qmel-spart.
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        CLEAR wa_output.
        READ TABLE it_ihpa INTO wa_ihpa WITH KEY objnr = wa_qmel-objnr.
        wa_output-parnr = wa_ihpa-parnr.
        wa_output-parvw = wa_ihpa-parvw.
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        CLEAR wa_output.
        READ TABLE it_crhd INTO wa_crhd WITH KEY objid = wa_qmel-arbpl.
        wa_output-arbpl = wa_crhd-arbpl.
        APPEND wa_output TO it_output.
        CLEAR wa_output.
        READ TABLE it_crtx INTO wa_crtx WITH KEY objid = wa_crhd-objid.
        wa_output-ktext = wa_crtx-ktext.
        APPEND wa_output TO it_output.
        CLEAR wa_output.
        READ TABLE it_qmfe INTO wa_qmfe WITH KEY qmnum = wa_qmih-qmnum.
        wa_output-fecod = wa_qmfe-fecod.
        wa_output-fegrp = wa_qmfe-fegrp.
        APPEND wa_output TO it_output.
        CLEAR wa_output.
        READ TABLE it_qmur INTO wa_qmur WITH KEY qmnum = wa_qmih-qmnum.
        wa_output-urcod = wa_qmur-urcod.
        wa_output-urgrp = wa_qmur-urgrp.
        wa_output-urtxt = wa_qmur-urtxt.
        APPEND wa_output TO it_output.
        CLEAR wa_output.
        READ TABLE it_iloa INTO wa_iloa WITH KEY iloan = wa_qmih-iloan.
        wa_output-tplnr = wa_iloa-tplnr.
        APPEND wa_output TO it_output.
        CLEAR wa_output.
      ENDLOOP.
      DELETE ADJACENT DUPLICATES FROM it_output  COMPARING        qmnum
                                                                  equnr
                                                                  ausvn
                                                                  ausbs
                                                                  auztv
                                                                  auztb
                                                                  iwerk
                                                                  qmtxt
                                                                  indtx
                                                                  priok
                                                                  strmn
                                                                  strur
                                                                  ltrmn
                                                                  ltrur
                                                                  vkorg
                                                                  vtweg
                                                                  spart
                                                                  parnr
                                                                  parvw
                                                                  arbpl
                                                                  ktext
                                                                  fecod
                                                                  fegrp
                                                                  urcod
                                                                  urgrp
                                                                  urtxt
                                                                  tplnr.
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    EXPORTING
      CLIENT                  = SY-MANDT
      FLG_USER_STAT           = ' '
       objnr                   =
      ONLY_ACTIVE             = 'X'
       spras                   = en
      BYPASS_BUFFER           = ' '
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      ANW_STAT_EXISTING       =
      E_STSMA                 =
      LINE                    =
      USER_LINE               =
      STONR                   =
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      OBJECT_NOT_FOUND        = 1
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      CLIENT                        = SY-MANDT
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       language                      =
       name                          =
       object                        =
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      HEADER                        =
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       lines                         =
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      ID                            = 1
      LANGUAGE                      = 2
      NAME                          = 3
      NOT_FOUND                     = 4
      OBJECT                        = 5
      REFERENCE_CHECK               = 6
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             WA_OUTPUT-iloan,
             WA_OUTPUT-ausvn,
             WA_OUTPUT-ausbs,
             WA_OUTPUT-auztv,
             WA_OUTPUT-auztb,
             WA_OUTPUT-qmtxt,
             WA_OUTPUT-indtx,
             WA_OUTPUT-strmn,
             WA_OUTPUT-strur,
             WA_OUTPUT-ltrmn,
             WA_OUTPUT-ltrur,
             WA_OUTPUT-objnr,
             WA_OUTPUT-arbpl,
             WA_OUTPUT-parnr,
             WA_OUTPUT-parvw,
             WA_OUTPUT-objid,
             WA_OUTPUT-ktext,
             WA_OUTPUT-fecod,
             WA_OUTPUT-fegrp,
             WA_OUTPUT-urcod,
             WA_OUTPUT-urgrp,
             WA_OUTPUT-urtxt,
             WA_OUTPUT-tplnr.
    *ENDLOOP.
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      BIN_FILESIZE                    =
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      FILETYPE                        = 'ASC'
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      CODEPAGE                        = ' '
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      WK1_N_SIZE                      = ' '
      WK1_T_FORMAT                    = ' '
      WK1_T_SIZE                      = ' '
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      GUI_REFUSE_FILETRANSFER         = 3
      INVALID_TYPE                    = 4
      NO_AUTHORITY                    = 5
      UNKNOWN_ERROR                   = 6
      HEADER_NOT_ALLOWED              = 7
      SEPARATOR_NOT_ALLOWED           = 8
      FILESIZE_NOT_ALLOWED            = 9
      HEADER_TOO_LONG                 = 10
      DP_ERROR_CREATE                 = 11
      DP_ERROR_SEND                   = 12
      DP_ERROR_WRITE                  = 13
      UNKNOWN_DP_ERROR                = 14
      ACCESS_DENIED                   = 15
      DP_OUT_OF_MEMORY                = 16
      DISK_FULL                       = 17
      DP_TIMEOUT                      = 18
      FILE_NOT_FOUND                  = 19
      DATAPROVIDER_EXCEPTION          = 20
      CONTROL_FLUSH_ERROR             = 21
      OTHERS                          = 22
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    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
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              and   b~ekgrp in so_ekgrp .
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       CLIENT                        = SY-MANDT
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    <--  p2        text
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          wa_fieldcat-seltext_m  = d.
          wa_fieldcat-tabname    = t.
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       CALL FUNCTION 'REUSE_ALV_EVENTS_GET'
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          I_LIST_TYPE           = 0
        IMPORTING
          ET_EVENTS             = it_event.
          READ TABLE it_event WITH KEY name = slis_ev_top_of_page INTO wa_event.
           IF SY-SUBRC = 0.
           MOVE 'TOP_OF_PAGE' to wa_event-form.
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        I_SCREEN_START_LINE            = 0
        I_SCREEN_END_COLUMN            = 0
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        PROGRAM_ERROR                  = 1
        OTHERS                         = 2
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    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
      ENDIF.
    endform.
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          WHEN '&IC1'.
            IF ls_selfield-fieldname = 'EBELN'.
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            IF ls_selfield-fieldname = 'BANFN'.
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              CALL TRANSACTION 'ME53N' AND SKIP FIRST SCREEN.
            ENDIF.
        ENDCASE.
    For classical
    use HIDE statement, AT LINE SELECTION event and CALL TRANSACTION Statement.
    regards,
    Prabhu
    Reward if it is helpful.

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