Aggregation with Below() not working as expected

[Brysonds]

Hello, I have a simple table that works as expected. It contains the following fields.

Year/Period

Sum(Price) 

Below(Sum(Price) 

Variance (between the two prior measures)

Change ( an if/then expression to show if the measure value increased from the prior month)

The problem I have is that when I add more dimensions (like Company and Customer), Below(Sum(Measure)) no longer works.

I tried using an aggr function to make this work, but haven't been successful. 

Sum(Aggr(Below(Price), Company, Customer, Year/Period)) returns values but not the correct ones

Below(Sum(Aggr(Price, Company, Customer, Year/Period))) returns nothing

Can anyone help with the correct approach?