Measure doesn't work properly with VAR, but works as a separate measure

[Axis]

So I'm trying to apply time intelligence for a measure inside variable 

Actuals by brand=

VAR ActualsLY=CALCULATE([Actuals];CALCULATETABLE(SAMEPERIODLASTYEAR('date new'[Date]);'date new'[Date with Data]=true))

VAR DispAS=SELECTEDVALUE('Displayed as:'[Displayed as:])

RETURN

SWITCH( TRUE();

DispAS="Actuals";[Actuals];

DispAS="Actuals LY"; ActualsLY)

And it returns the same set of data as my "Actuals" measure

However if I do it as a separate measure, it works okay for me

Actuals LY =

CALCULATE([Actuals by Brand];CALCULATETABLE(DATEADD('date new'[Date];-12;MONTH);'date new'[Date with Data]=true))

[AlB]

Hi @Axis 

Variables in DAX are immutable once they are assigned a value at declaration.  You need to use the measure if you want the result to be dependent on the context

Cheers