Nick,
That is definitely not the correct behavior. This activity creates a column in the source list that will point at the destination list and one in the destination list that will point back at the source. When you add these to your view, you should be able to click from source to destination and back again.
Is the field in the destination list pointing back to the correct source item?
I think that SP2 was installed on the machine I developed the code on, so that doesn't seem like the cause, but I will double check that.
In the mean time, if you find/solve your problem pleas post back your solution.
-Ryan
