How to derive a variable value from another variable of a different IO?

Hi Gurus,
I am aware that using BEx variables and Customer Exit you are able to derive a variable value from another variable of the same infoobject (for example, Fiscal Year/Period (0FISCPER) and Calendar Day (0CALDAY)).
However, is is possible, using the same approach to derive a variable value from another variable that is in a different InfoObject? (for example, Input Fiscal Year/Period (0FISCPER) but derive Output of Required Start Date (0REQSTDAT))?
There are 2 BEx variables involved,
1) A user entry variable that is restricted in 0FISCPER
2) A customer exit variable that is restricted in ZREQSTDAT
In CMOD under EXIT_SAPLRRS0_001, Include ZXRSRU01, the code (I assume, correct me if I'm wrong) should perform 3 functions in I_STEP = 2,
1) After the pop up, capture user entry of Fiscal Year/Period
2) Identify or convert Fiscal Year/Period to Calendar Day range (unsure on how to code this portion)
3) Use the Calendar Day to lookup on matching Required Start Date and display all Required Start Date that matches. (unsure on how to code on this portion)
Hope to hear your thoughts soon.
Regards,
Eric

Hi Shanthi,
I've made the necessary adjustments. The only difference in my code is,
Instead of,
If I_VNAM = 'ZREQSTDAT'
I use,
CASE I_VNAM.
Instead of,
PARAMETERS: ZFISCPER TYPE /BI0/OIFISCPER.
ZYEAR = ZFISCPER(4).
ZMM = ZFISCPER+4(3).
I use ,
This is the Customer Exit Variable in ZREQSTDAT
WHEN 'ZRSD_CX'.
The loop I use for the User Entry Variable in 0FISCPER-ZFYP_IN
LOOP AT I_T_VAR_RANGE INTO LOC_VAR_RANGE
      WHERE VNAM = 'ZFYP_IN'.
    IF SY-SUBRC = 0.
        CLEAR L_S_RANGE.
ZYEAR = LOC_VAR_RANGE(4).
ZMM = LOC_VAR_RANGE+4(3).
The codes were checked with no errors.
However, when I input the Fiscal Year/Periods and hit 'Execute'. The report went blank, not sure what is the cause. I've tried it several times. No error message appeared.
Regards,
Eric

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