Sorry for the delay. Your solution solved the problem. I was using the %Integer data type, but the solution was %Boolean.

Thank you for participation.
Take a look at this comment. I'm reposting a screenshot of the entire test table.
https://community.intersystems.com/post/conditions-quantity-select#comm…
The userActionten field in the last row has a value of 1. In fact, it is in all columns.

The result is the same: from one to four and with default.

There's not much code. In fact, there's none at all. All I have is a table with some data (the data is confidential) and a $SELECT() with the conditions described. I reproduced my case almost identically. All happend inside Architect and Analyzer. 

The source table I use in production always contains a matching row. If there's no user data, it's not recorded in the table. Therefore, the SELECT statement must match each condition with 100% certainty. And there are no restrictions (at least not ones that would exclude some conditions).

Both. But if i add trird condition the result is still two
 

$SELECT(%source.userActionone=1:"First user action", %source.userActiontwo=1:"Second user action", 1:"Other")

Thank for the comment. The result is the same
 
When constructing facts for a cube, each row of the source table is passed through the dimension logic and written to the fact table. In each row, some conditions are true, while others are false. Obviously, when rows pass through this logic, all 14 conditions are expected to be returned. But that does not happen for some reason.
 

Ok, lets say there is table   

SELECT 
userActionone, userActiontwo, userActionthree, userActionfour, userActionfive, userActionsix, userActionseven, userActioneigth, userActionnine, userActionten, userActioneleven, userActiontwelve, userActionthirteen, userActionfourteen
FROM TEST.TEST

Then we randomly populate it with 0 and 1.

Then we create a cube, dimension and function for it
 

$SELECT(
%source.userActionone=1:"User action one", 
%source.userActiontwo=1:"User action two",
%source.userActionthree=1:"User action three",
%source.userActionfour=1:"User action four", 
%source.userActionfive=1:"User action five", 
%source.userActionsix=1:"User action six", 
%source.userActionseven=1:"User action seven", 
%source.userActioneigth=1:"User action eigth", 
%source.userActionnine=1:"User action nine", 
%source.userActionten=1:"User action ten", 
%source.userActioneleven=1:"User action eleven", 
%source.userActiontwelve=1:"User action twelve", 
%source.userActionthirteen=1:"User action thirteen",
%source.userActionfourteen=1:"User action fourteen", 1:"Other")

Compile and build. Then look in analyzer. Only four this time. My production tables return 10 no matter what

Thanks for the comment. I tested $SELECT() in a similar script before writing this question and got the same result as yours.

Thanks for the reply!
As i said, the query works perfectly fine when executed normaly (without $$$ tokens). The data is correct
I should add some details then

When I compare dates in the WHERE clause, I convert them to INTs, just to make sure all the data is consistent. I also do a slightly more complex comparison. I've omitted the details because they're not relevant to my case

anotherDateField BETWEEN CAST(TO_CHAR(dateFieldOne, 'YYYYMM') as int) and CAST(TO_CHAR(dateFieldTwo, 'YYYYMM') as int)

Next, the date format is %TimeStamp, and it's very common in my data. I work with it every day, and every time function you can think of works without a problem
So the time data works fine, the outer WHERE clause doesn't catch up because of $$$RESTRICT in the inner section but without it the listing would not work at all

If it is pure ObjectScript how to write IF ELSE statement in %expression for example? Or can i use RETURN stetement? 

There are situations when you need to return a specific value. The Range expression doesn't work, for example, when you need to determine the display value for Null.

So there's only one way
IF 'value {return "Value is False"} else {return "Value is True"}
But this is wont work
I can still define a class method inside the cube and reference it from within, for example, %cube.CustomLogicClass(%source.DBValue), but that seems redundant. It leaves my cube looking cluttered with simple functions containing only if-else logic.

Thanks for the information, but I would like to see more comprehensive documentation. Such feature rich application and no solid docs anywhere. I think i would create an idea on Ideas Portal about it.

Thanks for the clarification.

Now that you've answered, I feel embarrassed by how easy it was to set the default data source.

But I must say, the error message is a bit confusing. If there's no way to set a default key:value pair from a termlist, why is the default editor available?