That does appear to be the case.
I made a workbook with an ATTR measure that did not
show up as a Sort Option.
However when I changed it to a Max, that version did appear.
Depending on the nature of your calculation, you may be able
to switch it to some other type of aggregation that will work.
Would you be able to post just the text of your calculated field in question?
If switching it out of ATTR is not an option, there are alternative ways of
sorting, depending on your graph. Namely putting a discrete copy
of your calculated field on the row/column shelf before the dimension that
needs to be sorted.
Please see workbook v10.3 attached in the Forum thread.
276825sort.twbx 1.2 MB