CR 11.5

I have 3 fields i am summarizing in my crosstab. The columns are using a CreateDate, grouped by month.

In my crosstab i have 3 rows:
1. Total Number of Unique Cases
2. Unique cases with a Representative
3. Unique cases without a Representative

For #1, i have the summarized field in the CT performing a DistinctCount on the Cases
For #2, i have the below forumla being summarized with a DistinctCount:

//@tmp_represented
if {temp_rep_app.COMPPOID} = {temp_rep_app.REPRESENT_PSOID} then {temp_rep_app.id}

For #3, i want (#1 from above) minus (#2 from above), which would give me the difference, and display how many Unique cases were Unrepresented.

Any ideas on how to do this?

maybe i think too simple but this could work
//@tmp_not_represented
if {temp_rep_app.COMPPOID} <> {temp_rep_app.REPRESENT_PSOID} then {temp_rep_app.id}