Hi Steve,
sorting on field B doesn't work because, system will be sorting in ascending order combing both Field A and Field B together. which will sort only A ..
Field B values are dependent on Field A, I will give an example of what I am trying to say.
ex: a transaction record with 2000(Field A) 75Z(Field B) has a value of 999(key figure)
when you sort Field B
2000 (Field A) 30U(Field B) --> what is corresponding key figure value should the system display? do you have any record with this combination in your cube? if no, then that is the reason, Field B never gets sorted.
if , yes , then it should sort in a way what you are expecting. Thanks