Indirect Set Analysis and List Box

[ciampaciampa]

Attached a picture that explains the problem.

I use a P() set analysis expression for answering to a query that requires an intersection between two sets.

The count calculation is correct.

Problem: The list box shows all the values while I want to show only the selected values by the expression (in this case just one - the "id1").

(Actually, I solved the problem using the Aggr() ("Interceptor" in the picture) but I don't like it as the Aggr() is a very resource consuming)

How to solve in a way more elegant and efficient?

Thanks

[sunny_talwar]

If you want to use set analysis, then Aggr() might be the only solution... I can't think of a way to avoid the use of Aggr()