Table Control, change data of itab on enter-click

Hello all, I have an itab gt_task_704 which I use to display in a table control.
When the user changes a field and pushes on the ENTER-KEY, I'm trying to modify this itab with the new content.
The issue I have is that some fields are updated with faulty content.
In PAI I'm doing the following:
PROCESS AFTER INPUT.
*&SPWIZARD: PAI FLOW LOGIC FOR TABLECONTROL 'TC_705'
LOOP AT gt_task_705.
    CHAIN.
      FIELD gs_task_705-zzpcod.
      FIELD gs_task_705-zprest_descr.
      FIELD gs_task_705-zmdhrs.
      FIELD gs_task_705-zhrs.
      FIELD gs_task_705-discipline.
      FIELD gs_task_705-zmdpctouts.
      FIELD gs_task_705-zpctouts.
      FIELD gs_task_705-zmdpctovhd.
      FIELD gs_task_705-zpctovhd.
      FIELD gs_task_705-zcomment.
    ENDCHAIN.
    MODULE update_table_705. "INPUT.
"MODULE sort_705.
ENDLOOP.
====> update_table_705:
DESCRIBE TABLE gt_task_705 LINES gv_lines_705.
IF tc_705-current_line LE gv_lines_705.
    "READ TABLE gt_task_705 INTO gs_task_705 INDEX tc_705-current_line.
    SHIFT gs_task_705-zhrs LEFT DELETING LEADING '0'.
    MODIFY gt_task_705 FROM gs_task_705 INDEX tc_705-current_line
                       TRANSPORTING zhrs zpctouts zpctovhd.
ENDIF.
CLEAR gs_task_705.
It seems like a problem of sorting I think but I still didn't manage to change the correct lines.
Can someone please give a helping hand to this young abap'er
Thanks in advance

Mr.Dragovian you write the module between chain..endchain.
chain.
module Md1 on chain-input.
endchain.
MODULE Md1 INPUT.
modify itab INDEX tc-current_line transporting fld(s).
ENDMODULE.
By this way,you will be able to get the correct user-entered data into itab.

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Table Control, change data of itab on enter-click

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