Rank expression problem

[#1]

Hey all,

Was hoping somebody could help with a formula (see below) it is supposed to give the sum total revenue for the top ten products (sku_id) as defined in the formula (basically where the sport conversion rate (units/visits) is greater than the conversion rate over the past 28 days. it is currently giving me a null value.

= '£' &

num(

sum(

{<sku_id= {"=rank(

sum(aggr(

IF((sum({$<fulfillment=>}units)/sum({$<fulfillment=>}visits))

>

(sum({<date= {"<=$(=Max(date)) >$(=Max(date)-28) "}, fulfillment=>}units)

/

sum({<date= {"<=$(=Max(date)) >$(=Max(date)-28) "}, fulfillment=>}visits))

,sum({$<fulfillment=>}views),'N/A')

,sku_id))

, sku_id) <=10"}>}

revenue )

, '#,###,###')

I previously had the formula as:

= '£' &

num(

sum(

{<sku_id= {"=rank(

sum(aggr(

IF((sum({$<fulfillment=>}units)/sum({$<fulfillment=>}visits))

> v_parent_conversion

,sku_id))

, sku_id) <=10"}>}

revenue )

, '#,###,###')

which was working, the only difference was I had a variable as the comparator in the IF statement. business rules of changed and the comparator is now at a product level.

This is a real sticking point so if anybody can point out where I am going wrong I would be very grateful!

Thanks,

Andrew