Ranking with Aggr() per region

[Primrose]

Hello,

I'm working on an app with a complicated data model. I have two expressions. The first one displays the ranking of products based on number of orders. The second one displays ranking based on customer's rating.

The first one is something like this:
Aggr(Rank(
if(Count(distinct {<Period={$(vCurrent_Period)},FieldType={'Quantity'},flag={1}>} [Counter Field])>=vThreshold,
Sum({<flag={1}>}Aggr(Sum({<Period={$(vCurrent_Period)},FieldType={'Quantity'}, flag={1}>}ValueField)*if(vType='Quantity',
sum({<flag={1}>}[Regional sales Weight])
,1
),
[Counter Field],ProductId)
)
),4,1),
Region,ProductId)

The second one is:
Aggr(Rank(
if(Count(distinct{<Period={$(vCurrent_Period)},FieldType={'Quality'},Rating={">0"}>} [Counter Field])>=vValue_Threshold,
(Count({<Period={$(vCurrent_Period)},FieldType={'Quality'},Rating={4,5}>}Rating) /
Count({<Period={$(vCurrent_Period)},FieldType={'Quality'},Rating={">0"}>}Rating))
-
(Count({<Period={$(vCurrent_Period)},FieldType={'Quality'},Rating={1,2}>}Rating) /
Count({<Period={$(vCurrent_Period)},FieldType={'Quality'},Rating={">0"}>}Rating))
)
,4,1)
,ProductId)

My goal is to make a sheet, where user can see stats per selected product ID. The first expression was reworked to look like this:

max({<ProductId = {Id1}>} Aggr(Rank(
if(Count(distinct {<Period={$(vCurrent_Period)},FieldType={'Quantity'},flag={1}>} [Counter Field])>=vThreshold,
Sum({<flag={1}>}Aggr(Sum({<Period={$(vCurrent_Period)},FieldType={'Quantity'},
flag={1}>}ValueField)*if(vType='Quantity',
sum({<flag={1}>}[Regional sales Weight])
,1
),
[Counter Field],ProductId)
)
),4,1),
Region,ProductId))

It works fine and I can see the correct ranking per region for the selected product ID. However, if I try to rework the second expression using the same approach, it doesn't work. Do you have any ideas why?

Thanks!