I don't think this should be a big deal to fix, but I'm confused by the question. Why are you testing if the two fields are equal to 1? How does this help you with the calculation of dividing sales by month? And what does 1 have to do with anything?

Also, a running total is not in the formula builder. You can right-click on a field and select Insert > Running Total. This works for simple totals without much logic needed. But in your case, you might need more work done to test when the formula should be calculated. In that case you have to create your own formula using a Global variable and in the formula use your logic to determine when to increment the variable's total.

Does this help at all?

Group on {caselog.case_district}.  Now create a set of running totals - one for each month - using something like the following format:

Field to summarize = the field you want to count
Type of summary = Count (or possibly DistinctCount, depending on your data.)
Evaluate: Use a Formula.  The formula will be like this: Month ({caselog.case_rptdate})=1 with the number changing for each month. 
Reset: On change of Group.  Select your case district group.

To test/debug, put some data in the details section along with your running total field.  You should see it increment for each record.  If it doesn't then something's not set up correctly.