Variable-Customer Exit on 0calday for two weeks range

Hi Gurus,

Please can any one help me Customer exit on 0calday for two weeks of range. The system should throw error if user enters more two weeks date range.

here my variable is 'ZSCM_CALDAY2' but it is showing 0DAT, as said
•The i_step = 3 its failing i am not sure from where the default values are coming as i_step = 1.
•i_t_var_range is getting sy-datum(today date),

I tried keeping my code in first line still not success

WHEN 'ZSCM_CALDAY2'.

IF i_step = 3.

  CLEAR : loc_var_range, ls_range.
  READ TABLE i_t_var_range INTO loc_var_range WITH KEY vnam = 'ZSCM_CALDAY2'.

  DATA : lv_DIFF TYPE I.

  if loc_var_range is NOT initial.

    LV_DIFF = loc_var_range-HIGH - loc_var_range-LOW.

    IF LV_DIFF <= 14.

      ls_range-low = loc_var_range-low.
      ls_range-high = loc_var_range-high.
      ls_range-sign = 'I'.
      ls_range-opt = 'BT'.

      APPEND ls_range TO e_t_range.
    ELSE.

      MESSAGE e009(zerrormsg) DISPLAY LIKE 'W' WITH text-000 .
    endif.
  ENDIF.
endif.