Error when updating back to ODS using tableview iterator.

Question

I get this error when I try to execute my bsp page. The page collects a cell value that was edited on the previous page and updates it to the ods.
The error is "Function not possible in a captured session"
The termination type was: TH_RES_FREE
When I debug, every thing looks fine. ITab3 returns values it's supposed to. So I am not sure what's causing it to fail. Any ideas? Thanks.
Here is my code:
CLASS cl_htmlb_manager DEFINITION LOAD.
DATA: event TYPE REF TO cl_htmlb_event.
event = CL_HTMLB_MANAGER=>get_event( runtime->server->request ).
if event->id = 'Update' and event->event_type = 'click'.
  DATA: tv TYPE REF TO cl_htmlb_tableview.
FIELD-SYMBOLS <i> LIKE LINE OF selectedrowindextable.
tv ?= cl_htmlb_manager=>get_data( request = runtime->server->request
                                 name = 'tableView'
                                 id = 'tv1' ).
IF tv IS NOT INITIAL.
DATA: tv_data TYPE REF TO cl_htmlb_event_tableview.
  tv_data = tv->data.
  refresh itab2.
  refresh itab3.
  call method tv_data->GET_ROWS_SELECTED
  receiving selected_rows = itab2.
  endif.
  data : ind type SELECTEDROW,
          row_s type row.
  if itab2 is not initial.
    data: rw LIKE LINE OF itab.
    loop at itab2 into ind.
    READ TABLE itab INDEX ind-index into
    rw.
    if rw is not initial.
    row_s = rw.
    append row_s to itab3.
    clear row_s.
    endif.
    endloop.
        MODIFY /bic/aNCN_O01300 FROM table itab3.
      ENDIF.
      endif.

Answer 1

hi Uday,
This is simple....
Use the function module
<b>1) For adding leading zero's or spaces...!</b>
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
  EXPORTING
    INPUT   = lw_variable
IMPORTING
   OUTPUT   = lw_variable.
<b>2) and for removing leading zero's or spaces.....</b>
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    INPUT   = lw_variable
IMPORTING
   OUTPUT   = lw_variable.
Hope this helps.
<b><i>Do reward each useful answer..!</i></b>
Thanks,
Tatvagna.