I have data that is set to Aggregate by average. I now want to show the delta for 3 Dimensions to the overall average. I can create a measure that is the average(measure) but this value is not the overall average. It is the average of averages.

There are 9 Level 2 Dimensions not shown. This makes the Ave(measure) <> Average(overall).
Is there a way to get the overall result so I can then calc the delta by lvl1?
I cannot find a syntax that can do this.