Regarding Report Group-GR55

hi friends,

I am running a report group using the T.Code GR55. In the selection screen when i enter the Fiscal Year-2007 and then run the report group it is generating an output. after that we are double clicking on the particular field on the output it is calling an abap program which has the fiscal year in the selection screen.but the ourput it is generating is showing all the values including 2006 and 2007. i just want to know the link between the report group and abap program ie if it is calling nay interface inbetween(also how the values are passed from the report group to the selection screen of abap program).