I've tried just about everything, Base without Text5 doesn't work, I manually hardcoded the MemberList that doesn't work either, must be a bug in a book, It's very strange and I think its related to the data buffer returning nothing when running a book, I run the cube view and it works just fine. I'm going to try to switch to an XFBR and see if a common separated list works. But I'm not confident that will work either since the issue seems to be with the data buffer actually returning anything when running a book. If you have time to look at this further I'd be happy to set up a call to discuss, I'm really at a loss of ideas.