How To Code the I_CALLBACK_USER_COMMAND = 'USER' in HR-ABAP

Dear Friends,
How to code the I_CALLBACK_USER_COMMAND = 'USER' in Reuse_Alv_Grid_Display in HR-ABAP

This is one method of programming the user_commend
call function 'REUSE_ALV_GRID_DISPLAY'
    exporting
      i_callback_program      = g_repid
      i_callback_user_command = 'USER_COMMAND'
      i_callback_top_of_page = 'TOP_OF_PAGE'
      i_structure_name        = 'I_DATA'
      is_layout               = gs_layout
      it_fieldcat             = gt_fieldcat[]
      it_sort                 = gt_sort[]
      i_save                  = 'A'
      is_variant              = es_variant
      it_events               = gt_events[]
      is_print                = gs_print
    tables
      t_outtab                = i_data
    exceptions
      program_error           = 1
      others                  = 2.
*& USER_COMMAND
*& This form is called through Function 'REUSE_ALV_GRID_DISPLAY'.
*& If you are in detailed mode then transaction PA20
form user_command using r_ucomm like sy-ucomm
                        rs_selfield type slis_selfield.
case r_ucomm.
    when '&IC1'.
      check rs_selfield-sel_tab_field = 'I_DATA-PERNR'.
      read table i_data index rs_selfield-tabindex.
      set parameter id 'PER' field i_data-pernr.
      call transaction 'PA20'.
    when others.
endcase.
endform.                    "user_command

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How To Code the I_CALLBACK_USER_COMMAND = 'USER' in HR-ABAP

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