Code help for formula variable with processing type customer exit

Hi Gurus,
I need help in user exit code. I am calculating a formula variable ( demand variability) in the user exit for a range of values given in the selection screen ( i.e processing based on the values given I_STEP = 2).
i am able to populate the E_T_RANGE table but the output is sending a single value output.
Expected Output
Plant ( sel screen Input) I Material ( Sel screen Input) I Demand Var(calculated O/P)
1800   I 12345 I   0.609
1700 I   21355 I   1.234
Actual Result
Plant ( sel screen Input) I Material ( Sel screen Input) I Demand Var(calculated O/P)
1800   I 12345 I   0.609
1700 I   21355 I   0.609(WRONG )
Here you can see that its sending the same values for all the plant and material combination.
I found in debugging that it populates 2 values into E_T_RANGE table in loop. But it is giving out only one value to all.
I tried to refresh and clear that but its giving the same output. Can we use E_T_RANGE in loop to give out range of values?. how to out put this throught user exit?
did anyone face this kind of issue and solved it?. Help is needed urgently. any help or guidance is greatly appreciated.
Regards
satish.

Hi Oliver,
Thanks for the reply. Dont get confused here please. It was an example . For example
I give one plant as input and 2 materials as input .
You see the sample code :
WHEN 'ZPRDEMVA'. ( formula variable name)
    IF i_step = 2.
      LOOP AT I_T_VAR_RANGE INTO LOC_VAR_RANGE
              WHERE VNAM = 'ZPRPLTSV'. ( plant variable input)
      CLEAR L_S_RANGE.
        v_werks          = LOC_VAR_RANGE-LOW.
      LOOP AT I_T_VAR_RANGE INTO LOC_VAR_RANGE
              WHERE VNAM = 'ZPRMATSV'.
      CLEAR L_S_RANGE.
        v_matnr          = LOC_VAR_RANGE-LOW.
CALCULATES THE FORMULA VARIABLE (DEMAND VARIABILITY)
WE TAKE DATA FROM ANOTHER ODS AND DOES CALCULATION.
      l_s_range-sign = 'I'.
      l_s_range-opt = 'EQ'.
      l_s_range-low = sum2.
DOES ALL CALCULATIONS PERFECTLY AND SINCE THERE ARE 2 MATERIALS AS INPUT, PUTS 2 VALUES IN E_T_RANGE. BUT IN THE OUPUT IT DUPLICATES SAME VALUE TO 2 RECORDS AS I POSTED IN THE FIRST
      Append l_s_range to E_T_RANGE.
      ENDLOOP.
      ENDLOOP.
    ENDIF.

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Code help for formula variable with processing type customer exit

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