A have created an edirectory connection, and have retrieved objects with
custom attributes (read self made schema extensions from the edirectory).

Now, I would like to validate the contents of said attributes. When
creating an "Analysis Profile", I do not seem to be able to see (and
select) the custom attribute.

I can see them however, if I browse the data I have collected.

Is it expected behaviour, not being able to see such an attribute when
creating an analysis profile?