How to get the first element of a List?

Hi,
I have the following hierachy:
A (top level)
-A1 (child of A)
-B1 (child of A)
--B11 (child of B1)
--B12 (child of B1)
I have an UDA on members B11 and B12 that have the same name as A1, and I use it to allocate values from A1 to B11 and B12. After that I want to aggregate the hierachy so I can have B1 and A with values.
I would like to use the ancestors function to do that but Ancestors need a member as parameter and the only relation between A1 and B11 and B12 is the UDA.
I can't do @ANCESTORS(@UDA(dimName, "A1")) because of that, so I would like to use a function to get at least 1 member that has the UDA I want and to use Ancestors on it, however I can't seem to find a function that returns the first member of a List.
Can someone help me on this?
Thank you

Unfortunately it doesn't work. @List requires members names so I can't provide a member set as an argument :(^^^Are you sure? Take a look at the below example from the Tech Ref. That sure looks like @LANCESTORS and @LIST is accepting more than just member names.
FIX(@LANCESTORS(@LIST(@ATTRIBUTE(Caffeinated_True),@ATTRIBUTE(Ounces_12),"200-40")))Also note this:
If the @LANCESTORS function is used alone (not within a FIX statement), you must use the @LIST function and specify member names. So you DO have to use @LIST if @LANCESTORS is to be used to do an aggregation. Or so it appears.
Regards,
Cameron Lackpour

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