MTD logic in Customer exit variable

Dear Friends,

I have a logic of MTD(Current date -1) in the reports and give option to just select month rather than date.If the user runs the query for current date(system Date) ex 30 June 2015, It should fetch the data from 1st june to 29 th june and also for previous 3 months ( MAR, APR,MAY from 1 to 29 for every month).

The logic i have written is :

WHEN 'ZVAR_V1'.



   IF I_STEP = 2.

IF SY-DATUM+6(2) >= 1.

   READ TABLE I_T_VAR_RANGE INTO WA_RANGE1
   WITH KEY VNAM = 'ZMTD_V1'.

    LV_CMON = WA_RANGE1-LOW+4(2).
    lv_cyer = WA_RANGE1-LOW+0(4).

   concatenate lv_cyer LV_CMON '01' into lv_day1.

   lv_date1 = SY-DATUM+6(2) - 1.
   concatenate lv_cyer LV_CMON lv_date1 into lv_day2.

   WA_RANGE-LOW = lv_day1.
   WA_RANGE-HIGH = lv_day2.
   WA_RANGE-SIGN = 'I'.
   WA_RANGE-OPT = 'BT'.
   append WA_RANGE to e_t_range.

ELSEIF SY-DATUM+6(2) = 1.

   READ TABLE I_T_VAR_RANGE INTO WA_RANGE1
   WITH KEY VNAM = 'ZCAL_MONV'.

    LV_CMON = WA_RANGE1-LOW+4(2).
    lv_cyer = WA_RANGE1-LOW+0(4).

   lv_cmon1 = lv_cmon - 1.
   lv_date2 = sy-datum+6(2).
   concatenate lv_cyer LV_CMON1 '01' into lv_day1.
   concatenate lv_cyer LV_CMON1 lv_date2 into lv_day2.

   CALL FUNCTION 'SLS_MISC_GET_LAST_DAY_OF_MONTH'
     EXPORTING
       DAY_IN                  = lv_day2
    IMPORTING
      LAST_DAY_OF_MONTH       = lv_day3
    EXCEPTIONS
      DAY_IN_NOT_VALID        = 1
      OTHERS                  = 2
             .

   WA_RANGE-LOW = lv_day1.
   WA_RANGE-HIGH = lv_day3.
   WA_RANGE-SIGN = 'I'.
   WA_RANGE-OPT = 'BT'.
append WA_RANGE to e_t_range.

ENDIF.
   ENDIF.

The query output :

I have created 4 variables for calday (CD). But the values care fetching till date for every variables. How to fix it.

Thanks

BASKAR