I figured out how to attach the file, if you edit datumLine001 you will see it's attached to the body from MultiTransform. If you edit the MultiTransform and add a polar pattern, it won't let you select datumLine001.
Also interestingly, using the move object after other object, I was able to move any type of reference geometry before the object that they reference, including a sketch.
I see, this is not intuitive, I assumed that if a pad dependent on MultiTransform can't be moved before the MultiTransform, then a datum Dependent on MultiTransform shouldn't be able to be moved before it either.
The dependency viewer shows the correct dependencies. I personally can't see any time that moving things in the tree out of alignment with their dependencies would be useful, but this is all good to know.
@Bance @chrisb thanks for the help.