Variables in set expression

[scarafias]

Hi Community,

I have a variable defined in the following manner:

count( $1
{<
field1 = {"Value1"},
field2 = {$2},
[Date1.Calendar.Year] = {$3} ,
[Date1.Calendar.MonthNro] = {$4},
[Date1.Calendar.Month]=,
field3 = {$5},
field4={"Value2"}
>} DISTINCT field5)

I define a metric like this:

$(vVariable(  ,"*",2021,1,"*"))

This returns an empty count, despite having records with Date1 in January 2021. There is an additional date field (Date2) in the data, with the same format as Date1, and if I replace Date1 by Date2 in the variable then the count works.

Any thoughts? Thanks.