FM working but variable is not getting displayed

Hi Experts

I have created Function module as below for BEx Variable.

  c_eq(2)  type c value 'EQ',    " for between

            C_i(1)   type c value 'I',     " for inclusive

            C_space(1) type c  value  ' ',

            c_1(1)   type n value '1'.





Data: l_s_range TYPE rsr_s_rangesid,

        l_vnam TYPE rszglobv-vnam,


v_sys_date  like sy-datum,            "format is yyyymmdd

      v_mth(2)      type n,

      v_qtr_mth  type STRING,

      v_year(4)     type n.

      l_vnam = i_vnam.



  IF l_vnam = 'ZVAR_EX_YYYYQ1'.





    l_s_range-sign = c_i.  " populate output for query

    l_s_range-opt  = c_eq.



    v_sys_date    = sy-datum.                " current system date

    v_year        = v_sys_date+0(4).

    v_mth         = v_sys_date+4(2).         " extract month

    v_qtr_mth     = 'Q1'.                    " For 1st Quarter



    concatenate v_year C_space v_qtr_mth into L_S_RANGE-LOW.

    APPEND l_s_range TO e_t_range.

It is giving me correct result in SE37, when i execute.

But, it is showing "empty demarcation" when i run the BEX query.

Please guide.

Thanks in advance.