Count occurences of a brk field in a subsum report

[aharown07]

I have a feeling an obvious answer is lurking on the fringes on my mind but I can't quite get it out in the open.

I have a report based on a table CallCodeOccurence

I have it subsummarizing by CallCodeType (from the related table CallCode)

The rows are basically a date, a call code, a description and a count field.

No problem counting the CallCodeOccurence records or totalling them.

But at the end of this report I need include a total number of CallCodeTypes that appear in the report (it's filtered by date range and other things).

So how can I display a total count of the CallCodeTypes?

I tried a summary field that counts CallCodeTypes but I get a value of 1 regardless of where I put it, even in a trailing grand summary.

So I'm missing a concept or two here I think.