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Rank() Function Question

Hi All,

It seems I could not achieve the desired result in my Table.

I have a Table of "Positive 1 STD Exceptions", Where each raw appear only if it is a "Positive 1 STD Exception".

That Table includes 3 dimensions: App, Advertiser and Campaign.

I would like to add a column as an expression labeled "Main Partner" to that table, where I will see the name of the partner which brought me the most revenue (from yesterday and belongs to  "PartnerReport", as you can see in my set analysis).

My Expression is:

=if([Exception type]='Positive 1 STD Exception',

if(rank(sum({<isYesterdayDate={'1'},PartnerReport={'PartnerReport'}>} (ClickCost+InstallCost)/100)) <2, partner_name)

)

However, I seem to be getting Null only as my results....

Here is a link to my QVW, if you could kindly assist me!

https://drive.google.com/file/d/0B4dVjL8rcPOCb0tmOVFrUTVMX00/edit?usp=sharing

Kind Regards,

Ella.