It is advisable to use cumulative measures instead or reference to the previous row to avoid looping within formulas and circular references.
You may then subtract this cumulative value from the base measure.
The easiest way to add a cumulative sum is by clicking on the column header and adding the cumulative sum.
Once you have the cumulative value available - you may use that in the formula for the Result calculations.
[Measures].[Open issues]-
[Measures].[Cumulative subtract]
Please note that this cumulative measure name will not autofill - you have to enter the name precisely.
Depending on the report context, there might be other options for the cumulative sum calculations.
You may read about calculating the cumulative sum with time dimension here - How to get cumulative sum?
Kind regards,
Oskars / support@eazybi.com