Why some values in program are automaticly increment?

[shiz0frenik]

Why some values in program are automaticly increment after starting 'At selection screen output' section.

I've got an programm, which is used in few transactions. 
In one of it values are changing after starting an 'At selection screen output'  section, and at second values are not changing.
There is no some additional inizialization, the code before 'At selection screen output is the same.

i try to find authorization object at su24, and one t-code has it, but there are no values that are aoutomaticly increments
in it.
what it can be if it not an authorization object, or mb values can initialize somwhere else( not in su24 ) ?

[Sandra_Rossi]

I don't understand the question, please give real data: which values, which program, what relationship with authorization object? Thanks.

[shiz0frenik]

It's an Z programm and Z authorization object. 
I intersted how it can automaticly increment if it doesn't happening inside program.
what are the ways can this be done in sap?

[shiz0frenik]

sry for mislead, it not increment, it automaticly reinitializes. 
and some select-options are automaticly initialize at once 'At selection screen output' block starts.

[Sandra_Rossi]

What code then?

I don't know your code. For instance, if you are changing the value of screen parameters during START-OF-SELECTION, what you are describing is normal.

Now please clarify what your code is.

[shiz0frenik]

INITIALIZATION.
  SET TITLEBAR '100'.
  SELECT SINGLE * FROM t159b WHERE repid = syst-repid.
  IF sy-subrc IS INITIAL.
    IF xcycl IS INITIAL.
      gidat = t159b-gidat.
      xlabst = t159b-xlabst.
      ximat  = t159b-ximat.
      xicha  = t159b-xicha.
      xinsme = t159b-xinsme.
      xspeme = t159b-xspeme.
    ELSE.
      xlabst = x.
      ximat  = space.
      xicha  = space.
      xinsme = space.
    ENDIF.
    sperr  = t159b-sperr.
*   #jko
    batin  = t159b-batin.
    IF sy-tcode = 'MI31'.
      IF c_use_function_modul IS INITIAL.
        batin  = t159b-batin.
*       clear call_fb.
      ELSE.
*       call_fb = t159b-batin.
        CLEAR batin.
      ENDIF.
    ENDIF.
    mappe  = t159b-mappe.
    xprot  = t159b-xprot.
    maxpo  = t159b-maxpo.
  ELSE.
    xlabst = x.
    xprot  = x.
  ENDIF.
* begin of note 494237
  IF sy-repid = 'RM07SVOR' OR sy-repid = 'RM07ICN1'.
    IF maxpo IS INITIAL.
      maxpo = 20.
    ELSEIF maxpo > 333.
      maxpo = 333.
      MESSAGE i717(m7).
    ENDIF.
  ELSE.
    IF maxpo IS INITIAL.
      maxpo = 20.
    ELSEIF maxpo > 300.
      maxpo = 300.
      MESSAGE i717(m7).
    ENDIF.
  ENDIF.
* end of note 494237
  IF mappe IS INITIAL.
    mappe = sy-repid.
  ENDIF.
  IF gidat IS INITIAL.
* &001 begin: Anpassung auf Zeitzonen
*   GIDAT = SY-DATUM.
    gidat = sy-datlo.
* &001 end
  ENDIF.

 CLEAR                      g_variant.
  MOVE  sy-repid             TO  g_variant-report.
  gx_variant = g_variant.

  CALL FUNCTION 'REUSE_ALV_VARIANT_DEFAULT_GET'
    EXPORTING
      i_save     = a
    CHANGING
      cs_variant = gx_variant
    EXCEPTIONS
      not_found  = 2.

  IF sy-subrc = 0.
    pa_vari = gx_variant-variant.
  ENDIF.

  IF r_werks-low IS INITIAL.
    GET PARAMETER ID 'WRK' FIELD r_werks-low.
  ENDIF.
  IF r_lgort-low IS INITIAL.
    GET PARAMETER ID 'LAG' FIELD r_lgort-low.
  ENDIF.

* set titlebar '100'.
  SELECT SINGLE * FROM t159b WHERE repid = syst-repid.      "n364559

  IF sy-subrc IS INITIAL.
    gidat = t159b-gidat.
    maxpo  = t159b-maxpo.
  ENDIF.

  IF maxpo IS INITIAL.
    maxpo = 20.
  ELSEIF maxpo > 333.
    maxpo = 333.
    MESSAGE i717(m7).
  ENDIF.

  IF gidat IS INITIAL.
    gidat = sy-datlo.
  ENDIF.

* if no parameter is marked, open stock selection              "HW614297
  IF xlabst IS INITIAL AND xinsme IS INITIAL AND            "HW614297
     xspeme IS INITIAL AND xwart IS INITIAL.                "HW614297
    zw_zustand_sto = 'S'.                                   "HW614297
  ENDIF.                                                    "HW614297

* check parameters for function : one must be marked
* take the value from default table T159L
  CLEAR  cnt_lines.
  IF  NOT  xtest IS INITIAL.
    ADD  1                   TO  cnt_lines.
  ENDIF.

  IF  NOT  batin IS INITIAL.
    ADD  1                   TO  cnt_lines.
  ENDIF.

  IF  NOT  call_fb IS INITIAL.
    ADD  1                   TO  cnt_lines.
  ENDIF.

  CASE    cnt_lines.
    WHEN  0.
      MOVE  x                TO  xtest.
    WHEN  1.
*     ok
    WHEN  OTHERS.
*     read parameter table for inventory reports
      SELECT SINGLE * FROM t159b WHERE repid = syst-repid.

      IF sy-subrc    IS INITIAL  AND
         t159b-batin =  x.
        CLEAR : xtest,       call_fb.
        MOVE  t159b-batin    TO  batin.
      ELSE.
        MOVE  x              TO  xtest.
        CLEAR : batin,       call_fb.
      ENDIF.
  ENDCASE.

* clear parameters who are not active in all reports RM07I*31
  CASE    sy-repid.
    WHEN  'RM07IM31'.
*     special stock M does not allow stock in Quality inspection and
*     blocked stock
      CLEAR : xinsme,        xspeme.

    WHEN  'RM07IO31'  OR  'RM07IV31'  OR  'RM07IW31'.
*     special stocks O, V, and W do not allow block stock
      CLEAR :                xspeme.
    WHEN  OTHERS.
  ENDCASE.
AT SELECTION-SCREEN OUTPUT.

I don't know why but parametrs : 'r_mtart' and 'LBTCH' is changing at once 'At selection screen output' block is starts.
it's changing in one t-code and doesn't in another. It goes throw the code absolutely same in both cases

PARAMETERS: lbtch LIKE am07m-xonul MODIF ID btc DEFAULT 'X'.
SELECT-OPTIONS  r_mtart FOR mara-mtart MEMORY ID mta.

[shiz0frenik]

It was solved.
It was happenning because of the variants.
It was protected at Goto-> Variants, so i cannot choose it GetVariant button on Selection-screen