What is $:: in set analysis for?

[#1]

Hi,

What is $:: in set expression for?

Example: Sum({[Group 1]<[Product Sub Group]=, Path = $::Path, Region = $::Region, Year = $::Year, Quarter = $::Quarter, Month = $::Month>} Sales)

Thanks

[#2 · Accepted solution]

Just found the answer from another thread.

"

     $:: is to use the selection in the default state filters.instead of $ you can specify the group name to synchronize with it

"

Credit to: Celambarasan