Running Sum in a report over a group

C

cmk

I have 4 headers/footers and my report is run off a query that has two
tables. When I choose a field and do a running sum over all it the running
sum works, but when I change it from over all to group I have 0's returned.
I have the running total in the first header. Any ideas what is causing
this.

Please Help
 
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