Drill Through From Drill Down

I have a report grouped that has a drill down, from the drill down
records, I can drill through to another report that has the details of
the records recorded on the drill through.
Example:
Location (Drill Down)
+York
+Cardiff
+London
Displays:
-York
Team1
Team2
Team3
-Cardiff
Team1
Team2
Team3
-London
Team1
Team2
Team3
Each of the Teams below the locations have a drill-through connection
to another report. My issue is that the Location parameter is only
being passed to one of the Locations on the Drill Through. The other
locations are asking for a location parameter.I found this issue. I had been 'caseing' my initial display to format
the display, and this then passed through a wrong parameter value to
the drill through report.