problem in data selection tab in infopack

Hi,

I created one text datasource ZACCOUNT_GRP_TEXT based on infoset.

in r/3 , SPRAS is selected as a selection field .

but wen i created the infopak for this , in data selection tab its not giving me the option of sparas selection dats coming blank .

plz let me know the reason why data selection tab is blank and how i can correct it.

thnx