The D365 guys have come up with this Global Address Book situation:

Notice the top 2 show lookups to contact. I don't know what the functional difference is supposed to be -- not sure MS does -- but I am unable to trim one from the mapping. For my purposes I would like only the top one to fill in on the form when I hit the New CfC/V button.
But I can't drop the second one. Is this because every lookup relationship mapping MUST include ALL like lookups? Is this regular, normal behavior?