SSRS 2008 R2: Passing multiple values to a drill through report parameter

Hi Everyone,

I have a main report and a drill through report.  The data set for the main report is as follows:

MajorGroup      Group      SubGroup      DetailGroup     Region     Site      Date               Type      Count

MajorGroup1     Group1     SubGroup1     DetailGroup1    Region1   Site1     2012-02-01     Type1    1

MajorGroup1     Group1     SubGroup1     DetailGroup1    Region1   Site1     2012-08-01     Type2    1

The main report is summarized so that the data looks like the following

MajorGroup      Group      SubGroup      DetailGroup     Region     Site      Count

MajorGroup1     Group1     SubGroup1     DetailGroup1    Region1   Site1     2

I have a "go to report action" set at the Count level which passes 4 parameters to the drill through report.

Site               Site_ID

Type              Type_ID

Date              Date_Key

DetailGroup   DetailGroup_ID

The drill through report runs but the problem is that only the first record in the data set gets passed to the drill through report rather than sending multiple values for Type and Date.  I've made sure that the parameters in the drill through report accept multiple values but it seems like the drill through parameters in the main report aren't passing multiple values.

Please let me know what I'm doing wrong or if there's a work around so I can pass some kind of an array to the drill through report for the Type and Date field.

Thanks for your help,

Dan