Set expression.

[Bobi]

I try to calculate CM1% (contribution margin in %). This shall be done for only 2019.

avg({$<$(vL.CY)>}((CM1)/([Net Sales Amount]))) is the one I have tried recently. That gives a little bit higher values than it should. 

vL.CY variable is: [Booking ActualDate]={1},[Booking YearsAgo]={$(=min("Booking YearsAgo"))}

This expression works for calculating the right CM1% value (however this summarize for longer period, I only want current year.)

sum({$<[Booking ActualDate]={1}>}[CM1])/sum({$<[Booking ActualDate]={1}>}[Net Sales Amount])

Anyone see what causes the error?