No user input for the field on which i need to write customer exit code.

Question

Hello everyone,
Scenario:
There are differrent lease type and there Start date and expiry date.
each lease has to return somoe returns on some basis.
selection screen has four options but none of them is date.
My understanding:
I need to get only those leases in my report whose expiry date is greater than system date/current calendar day.
I am not selecting any date field in selection screen, so i need to get value of expiry date from cube, and than compare it to current date.
So i need to write a customer exit in which i need to read date and restrict data on this expiry date.
Requirment:
Need a code for SAP exit variable which will meet the following requirment
There are the following 4 variables in the query.
1) material
2) product hierarchy
3) City
4) lease type
I need a customer Exit variable (CMOD) that will
filter the records on the basis of condition-"lease expiry date is greater than current system" and display all the records whose expiry date is greate than Sy Date (Current Date) and also if expiry date is blank.
kindly give me information on how i can write this code asap; and let me know if need more information.
Thanks

Answer 1

I am Getting the same error for both the codes that i have written...
Do i Need to write sth else in the code...
Code:
WHEN 'ZVLIVELEASES'.
  IF I_STEP = 2.
        L_DATE = SY-DATUM.
        SELECT * FROM "DSO_ACTIVE_TABLE"
            INTO TABLE ITAB_LL where "EXPIRY_DATE" > L_DATE.
        LOOP AT ITAB_LL INTO WA_LL.
        CLEAR l_s_range.
        l_s_range-sign = 'I'.
        l_s_range-opt = 'EQ'.
        l_s_range-low = WA_LL-"EXPIRY_DATE".
       APPEND L_S_RANGE TO E_T_RANGE.
        ENDLOOP.
   ENDIF.
Error: Error for variable in customer enhancement ZLIVELEASES