Custom agg formula- all numbers same or show null

Hello,
I'm trying to develop a custom aggregation formula for a certain set of measures in a cube. The formula is as follows...take the average of the measure at any level of dimensionality for a given day, but only if they are all the same number. If any number
differs, show a null. That's probably the best way I can explain it.
For example:
10, 10, 10, 10 = 10
10, 10, 10, 11 = null
10, 10, 11, 11 = null
The users want to validate the measure at the highest level of dimensionality for a given day, and only drill down to the lower levels if at least one of the numbers differ from the others (ie a null is shown as the aggregation). I hope that explanation
makes sense.
It's been a few years since I was deep into MDX and cube formulas. Any tips on starting points, or possibility of doing this, is greatly appreciated. I've been reviewing the MDX documentation and haven't zeroed in on my potential solution yet.
Thank you.
Dave
EDIT: Just wanted to follow up on our interim solution. We created a calculated member for the average of each measure, and a separate calculated member for distinct count of the average values. This way we can see if they are all the same at a high level,
and we have the added benefit of knowing how many different values we have if any do indeed differ. Chances are this will satisfy business requirements. If we arrive at the solution I originally described above, I will follow up with how we solved it for anyone
interested.

Hi dmasino,
According to your description, you want to custom aggregation formula. If the all values in that set are same, return that value, other wise return null. Right?
In this scenario, we can use put the distinctcount() and distinct() within a IIF() condition to achieve your goal. Please refer to the query below:
WITH SET MySet AS
//put statement here
MEMBER Measures.CustomAggregation AS
IIF(DISTINCTCOUNT(MySet)=1,DISTINCT(MySet),NULL)
If you have any question, please feel free to ask.
Simon Hou
TechNet Community Support

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