Change the sy-tabix dynamically

Question

Hi ,
could any one please let me know , is there any way that
i can change  the sy-tabix value dynamically , while passing an ITAB
into a Work area.  actually i have inserted a record into an ITAB , while
Looping the same  into a WA with an index witch already executed by the same loop.next  time i want to execute (Loop to the Wa) the Newly added Record .
LOOP AT itab.
idx = sy-tabix + 1. ...
(do something) ...
INSERT itab INDEX idx. ...
ENDLOOP.
In this way , the next record to be read is the one
inserted recently...
Thx in Advance
Dilum Alawatte

Answer 1

Hello Dilum
Even if you itab has a single record your loop will run indefinitely until the program dumps due to a memory problem.
Assuming that you want to process all initial records in your itab (i.e. start with 10 records -> end with 20 records) the solution is quite simple:
*& Report  ZUS_SDN_INFINITE_LOOP
REPORT  zus_sdn_infinite_loop.
TYPES: BEGIN OF ty_s_itab.
TYPES: counter  TYPE i.
TYPES: END OF ty_s_itab.
DATA: gt_itab   TYPE STANDARD TABLE OF ty_s_itab,
      gs_line   TYPE ty_s_itab,
      gd_idx    TYPE i,
      gd_max    TYPE i.
START-OF-SELECTION.
  gs_line-counter = 1.
  APPEND gs_line TO gt_itab.
  LOOP AT gt_itab INTO gs_line.
    gd_idx = syst-tabix + 1.
    gs_line-counter = gd_idx.
    WRITE: / gs_line-counter.
    INSERT gs_line INTO gt_itab INDEX gd_idx.
    IF ( gd_idx >= 10 ).  " avoid indefinite loop
      EXIT.
    ENDIF.
  ENDLOOP.
  " NOTE: gt_itab contains 10 records
  SKIP.
  WRITE: / syst-uline.
  SKIP.
  DESCRIBE TABLE gt_itab.
  gd_max = syst-tfill.
  LOOP AT gt_itab INTO gs_line FROM 1 TO gd_max.
    gd_idx = syst-tabix + gd_max.
    gs_line-counter = gd_idx.
    WRITE: / gs_line-counter.
    INSERT gs_line INTO gt_itab INDEX gd_idx.
**    IF ( gd_idx >= 10 ).
**      EXIT.
**    ENDIF.
  ENDLOOP.
END-OF-SELECTION.
Regards
  Uwe