Nested Aggregates in Report Table with Groupings

Question

I've come across the well known problem of needing to nest aggregates in a report which has a table with groupings. I have come up against a bit of a problem with the suggested workaround posted in severla threads of using custom code and variables as a way round this.
Basically I have several groupings in my report, the inner most of which  has a field which needs to return the MAX value of the rows contained within it.  Then depending on what this value is i need a count of these values that match a particular criteria eg if it ends in a "T" count it if it doesn't then don't.
I have a businees area group surrounding that inner grouping and i need to sum to the rows that match that particular criteria, but i can't have a sum of the values because they are calculated using the MAX aggreagte.
The partial way round it i have found is to use some custom code and create a variable that i can increment each time one of the rows matches the criteria i want
Code Snippet
Public Shared sum_monday As Integer = 0
Public Shared Function SumMon(ByVal Value As Integer)
    sum_monday = sum_monday + Value
End Function
i use the code below to increment the variable
Code Snippet=Code.SumMon(IIF(right(MAX(Fields!Monday.Value),1)="T",1,0))
and in the group footer i use the code below to display the total
Code Snippet=code.sum_monday
the problem i have is that i can't work out how to reset the count for each grouping because at the minute its effectively a running total.  I need to have a sum of the particular group rather than a running sum including all the previous groupings.
Apologies if some of the above isn't clear , i'm a bit useless at writing clear explanations
Any help much appreciated.
 

Answer 1

Hi Rob (catz)
Thanks for your suggestion, i've come back to this report having left it for a while and i've just tried your suggestion but the problem i have is that i can't get the total to display in the outer group where i need it. The total appears in the next groups header instead.
Group 1 Header   =Code.SumMon(0,0)     =code.sum_Monday
Group 2 Header   =Code.SumMon(Fields!ACTUAL_MILES.Value,1)   =code.sum_Monday
Group 1 Footer    =code.sum_Monday
will result in
Group 1 Header   0
Group 2              21   21
                          13   34
                          10   44
                          15   59
Group 1 Footer    0
Group 1 Header   59
Group 2              10   10
                          12   22
                          13   35
                          14   49
Group 1 Footer    59
Any suggestions welcome