Query Customer Exit - Multi Single Values

Question

Hi SDN,
Is it possible to return multi-single values in a customer exit for a query variable or only a range?
I have 2 characteristics (NUMC), an item ZITEM and a group ZGROUP.  An item can belong to many groups.
ZITEM           ZGROUP
1                     1
1                     2
2                     3
4                     1
I would like to create a variable in Query Designer for ZITEM that returns a list of single values for ZITEM (not a range).  For example, Group 1 should return items 1, 4.
The relationship between ZITEM and ZGROUP is not defined in master data (compounding).  Currently, I have a DSO which has ZITEM and ZGROUP defined as a key.  I would like my query variable-customer exit to read the DSO and return a list of single values of ZITEM.
I'm assuming making ZGROUP a compounding infoobject of ZITEM would solve the issue in query designer because I could restrict on ZGROUP.  I have not used this approach because it would require modifying standard extractors.
Another option I explored was to create an Infoset between my InfoCube and the DSO which has ZITEM & ZGROUP.  Unfortunately my InfoCube has NonCulm. Key Figures and therefore cannot be used in an infoset.
Does anyone know how to create a multi-single value customer exit or have any ideas on how to solve this problem?
Thanks!

Answer 1

I was able to create a customer exit which performed multi-single values.
Psuedocode:
1) Create Internal Table and populate it with DSO data for Group and Item
2) In Customer Exit, loop through internal table for the group you want
3) In loop, append l_s_range to e_t_range (this will add multi-single values)
WHEN 'ZCX_FLWGRP60'.
    IF I_STEP = 2.
      l_s_range-sign = 'I'.
      l_s_range-opt = 'EQ'.
      "get multi single values for flow types
      LOOP AT l_t_flwgrp INTO l_s_flwgrp
        WHERE /BIC/ZFLW_TP_G = '60'.
        l_s_range-low = l_s_flwgrp-FS_FLW_TP.
        append l_s_range TO e_t_range.
      ENDLOOP.
    ENDIF.