User exit in ME22N to change standard fields

Dear all,

I'm trying to change the delivery date from exit EXIT_SAPMM06E_013 but the system doesn't keep my changes. I'm able to change the delivery date in exit EXIT_SAPMM06E_017 but I need to make it from exit 013 because I need know the confirmations from tables XEKES/YEKES.

I'm on release 4.6C and I don't have the chance to use the BADI ME_PROCESS_PO_CUST.

Is there a way to make this from exit 013?

Here is the code I'm trying to use:

  DATA : wa_table(100) TYPE c,
         t_ett         TYPE STANDARD TABLE OF beket,
         wa_ett        TYPE beket.

  FIELD-SYMBOLS: <fs_ett> TYPE ANY TABLE.

  IF sy-tcode = 'ME22N'.
    wa_table = '(SAPLMEPO)ETT[]'.
  ELSEIF sy-tcode = 'ME22'.
    wa_table = '(SAPMM06E)ETT[]'.
  ELSE.
    EXIT.
  ENDIF.

  ASSIGN (wa_table) TO <fs_ett>.
  t_ett[] = <fs_ett>[].

  LOOP AT t_ett INTO wa_ett.
    IF sy-tcode(4) = 'ME21'.
      wa_ett-eindt = sy-datum.
    ELSEIF sy-tcode(4) = 'ME22'.
      wa_ett-eindt = sy-datum.
      wa_ett-updkz  = 'U'.
    ENDIF.
    MODIFY t_ett FROM wa_ett.
  ENDLOOP.

  <fs_ett>[] = t_ett[].
  UNASSIGN <fs_ett>.

Thanks for your help.

Elio