This is a problem that occurs from time to time,

I have added a Time Series pair for statistical analysis:

- Link discharge (from MIKE URBAN .PRF)
- External time series (flow measurement)

Both show up correctly as a graph (Discharge vs Time), and I choose to calculate based on "Zoom extent".

After pressing Calculate, either "Volume modelled" or "Volume observed" will show garbage (in this case negative values, see attached screenshot), and a correct "Volume error" calculation is not possible.

Any suggestions?