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The follow program demonstrates how to capture which rows of the ALV grid the user has selected.

Changes required from a basic ALV grid include adding a new field to ALV grid data table(it_ekko-sel) and adding an entry to the layout control table (gd_layout-box_fieldname = 'SEL'). Please note you need to use the SHIFT and CONTROL keys to select multiple rows.

 

TABLES:     ekko.

TYPE-POOLS: slis.                                 "ALV Declarations
*Data Declaration
*----------------
TYPES: BEGIN OF t_ekko,
  sel,                         "stores which row user has selected
  ebeln TYPE ekpo-ebeln,
  ebelp TYPE ekpo-ebelp,
  statu TYPE ekpo-statu,
  aedat TYPE ekpo-aedat,
  matnr TYPE ekpo-matnr,
  menge TYPE ekpo-menge,
  meins TYPE ekpo-meins,
  netpr TYPE ekpo-netpr,
  peinh TYPE ekpo-peinh,
END OF t_ekko.

DATA: it_ekko TYPE STANDARD TABLE OF t_ekko INITIAL SIZE 0,
      wa_ekko TYPE t_ekko.

*ALV data declarations
DATA: fieldcatalog TYPE slis_t_fieldcat_alv WITH HEADER LINE,
      gd_tab_group TYPE slis_t_sp_group_alv,
      gd_layout    TYPE slis_layout_alv,
      gd_repid     LIKE sy-repid.

************************************************************************
*Start-of-selection.
START-OF-SELECTION.

  PERFORM data_retrieval.
  PERFORM build_fieldcatalog.
  PERFORM build_layout.
  PERFORM display_alv_report.

*&---------------------------------------------------------------------*
*&      Form  BUILD_FIELDCATALOG
*&---------------------------------------------------------------------*
*       Build Fieldcatalog for ALV Report
*----------------------------------------------------------------------*
FORM build_fieldcatalog.

* There are a number of ways to create a fieldcat.
* For the purpose of this example i will build the fieldcatalog manualy
* by populating the internal table fields individually and then
* appending the rows. This method can be the most time consuming but can
* also allow you  more control of the final product.

* Beware though, you need to ensure that all fields required are
* populated. When using some of functionality available via ALV, such as
* total. You may need to provide more information than if you were
* simply displaying the result
*               I.e. Field type may be required in-order for
*                    the 'TOTAL' function to work.

  fieldcatalog-fieldname   = 'EBELN'.
  fieldcatalog-seltext_m   = 'Purchase Order'.
  fieldcatalog-col_pos     = 0.
  fieldcatalog-outputlen   = 10.
  fieldcatalog-emphasize   = 'X'.
  fieldcatalog-key         = 'X'.
*  fieldcatalog-do_sum      = 'X'.
*  fieldcatalog-no_zero     = 'X'.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'EBELP'.
  fieldcatalog-seltext_m   = 'PO Item'.
  fieldcatalog-col_pos     = 1.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'STATU'.
  fieldcatalog-seltext_m   = 'Status'.
  fieldcatalog-col_pos     = 2.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'AEDAT'.
  fieldcatalog-seltext_m   = 'Item change date'.
  fieldcatalog-col_pos     = 3.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'MATNR'.
  fieldcatalog-seltext_m   = 'Material Number'.
  fieldcatalog-col_pos     = 4.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'MENGE'.
  fieldcatalog-seltext_m   = 'PO quantity'.
  fieldcatalog-col_pos     = 5.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'MEINS'.
  fieldcatalog-seltext_m   = 'Order Unit'.
  fieldcatalog-col_pos     = 6.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'NETPR'.
  fieldcatalog-seltext_m   = 'Net Price'.
  fieldcatalog-col_pos     = 7.
  fieldcatalog-outputlen   = 15.
  fieldcatalog-do_sum      = 'X'.        "Display column total
  fieldcatalog-datatype     = 'CURR'.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.

  fieldcatalog-fieldname   = 'PEINH'.
  fieldcatalog-seltext_m   = 'Price Unit'.
  fieldcatalog-col_pos     = 8.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.
ENDFORM.                    " BUILD_FIELDCATALOG
*&---------------------------------------------------------------------*
*&      Form  BUILD_LAYOUT
*&---------------------------------------------------------------------*
*       Build layout for ALV grid report
*----------------------------------------------------------------------*
FORM build_layout.
  gd_layout-box_fieldname     = 'SEL'.
  "set field name to store row selection
  gd_layout-edit              = 'X'. "makes whole ALV table editable
  gd_layout-zebra             = 'X'.
ENDFORM.                    " BUILD_LAYOUT
*&---------------------------------------------------------------------*
*&      Form  DISPLAY_ALV_REPORT
*&---------------------------------------------------------------------*
*       Display report using ALV grid
*----------------------------------------------------------------------*
FORM display_alv_report.
  gd_repid = sy-repid.
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program      = gd_repid
      i_callback_user_command = 'USER_COMMAND'
      is_layout               = gd_layout
      it_fieldcat             = fieldcatalog[]
      i_save                  = 'X'
    TABLES
      t_outtab                = it_ekko
    EXCEPTIONS
      program_error           = 1
      OTHERS                  = 2.
  IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
ENDFORM.                    " DISPLAY_ALV_REPORT
*&---------------------------------------------------------------------*
*&      Form  DATA_RETRIEVAL
*&---------------------------------------------------------------------*
*       Retrieve data form EKPO table and populate itab it_ekko
*----------------------------------------------------------------------*
FORM data_retrieval.

  SELECT ebeln ebelp statu aedat matnr menge meins netpr peinh
    UP TO 10 ROWS
    FROM ekpo
    INTO CORRESPONDING FIELDS OF TABLE it_ekko.
ENDFORM.                    " DATA_RETRIEVAL
*------------------------------------------------------------------*
*       FORM USER_COMMAND                                          *
*------------------------------------------------------------------*
FORM user_command USING r_ucomm LIKE sy-ucomm
                  rs_selfield TYPE slis_selfield.

* Check function code
  CASE r_ucomm.
    WHEN '&IC1'.
*   Check field clicked on within ALVgrid report
      IF rs_selfield-fieldname = 'EBELN'.
*     Read data table, using index of row user clicked on
        READ TABLE it_ekko INTO wa_ekko INDEX rs_selfield-tabindex.
*     Set parameter ID for transaction screen field
        SET PARAMETER ID 'BES' FIELD wa_ekko-ebeln.
*     Sxecute transaction ME23N, and skip initial data entry screen
        CALL TRANSACTION 'ME23N' AND SKIP FIRST SCREEN.
      ENDIF.

    WHEN '&DATA_SAVE'.  "user presses SAVE
      LOOP AT it_ekko INTO wa_ekko.
        IF wa_ekko-sel EQ 'X'.
*       Process records that have been selected
        ENDIF.
      ENDLOOP.
  ENDCASE.
ENDFORM.                    "user_command