Editing a field in ALV and validating the newly entered Value

Hi Experts,
I have an ALV report in grid display (not object oriented). My requirement is to edit a field on the output and write the validations to validate the value that was edited on the ALV output.
This can be done using object oriented coding by using the method check_changed_data. For this to happen, i need to change the entire scope of my report into object oriented, which is like reinventing the wheel.
Since my report was developed using classical ABAP, what needs to be done to get this functionality. Any suggestions are welcome.
Thanks.

in the FM 'REUSE_ALV_GRID_DISPLAY' import parameter IS_LAYOUT check out the columsn EDIT and EDIT_COLUMN. Also Use FM 'REUSE_ALV_EVENTS_GET' to get list possible event and pass a subroutine name which will be called when ever event is fired.
example:
CALL FUNCTION 'REUSE_ALV_EVENTS_GET'
    EXPORTING
      i_list_type = 0
    IMPORTING
      et_events   = l_events.
READ TABLE l_events WITH KEY name = slis_ev_top_of_page
                               INTO g_event.
IF sy-subrc = 0.
    MOVE top_of_page TO g_event-form.
    APPEND g_event TO t_events.
ENDIF.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_buffer_active    = 'X'
      i_callback_program = t_repid
      is_layout          = t_layout
      it_fieldcat        = t_fieldcat[]
      i_save             = t_save
      it_events          = t_events[]
    TABLES
      t_outtab           = g_editpos1[].

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Edit an field in alv and save it

i have an report in alv, i have used func module 'alv_list_display'.
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Hi,
you have to use fieldcat-input = 'X', and edit = 'X'.to make the fields editable in alv display.and SAVE you need the SAVE button.
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exceptions
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endif.
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"give some OKCODE to SAVE button and handle it
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form status using p_extab type slis_t_extab.
*- Pf status
set pf-status 'STATUS'.
endform.                 " STATUS
form user_command using r_ucomm     like sy-ucomm
                               rs_selfield type slis_selfield.
case r_ucomm.
    when 'BACK' or 'CANC' or 'EXIT'.
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endcase.
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How to add a field to the selection screen and when the user enters ...

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Hi Mayank,
Thanks for the reply
I am using oops method.
I tried making the field which is to be made editable as wa_fieldcatalog-edit = 'X'. But its not working. I didnt get you when you said edit in layout object.
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      cntl_system_error           = 2
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Editing a field in ALV and validating the newly entered Value

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