This conversation has been merged. Please reference the main conversation: Lightroom: Smart collections missing criterion for "Collection Set"
Aperture had the ability to limit Smart Albums to filtering a specific album. This rule gave a drop down list of all the available Albums. Pretty simple and straightforward. And best of all, IT WORKED! Heck, even the new Photos app gets this (a screenshot of it is attached).
In Lightroom, in theory, you can limit a Smart Collection to a specific Collection or Collection Set, but it doesn't seem to work constantly.
PLEASE allow Smart Collections to filter via Collection Set.
PLEASE allow the "Collection" filter in the Smart Collection set to be set to "is" (as seen in the attached Photos.app screenshot). If its not an exact match, then the Collection/Collection Set doesn't get included. Including text in quotes does not perform the expected operation.
It shouldn't have to be a trial and error operation to do something which could be SO simple.
This makes Smart Collections a complete pain in the bum to use on Lightroom.
It would be amazing if Lightroom management could know that even the small things matter.