Reported 2017-09-29:

https://lists.oasis-open.org/archives/ubl-comment/201709/msg00018.html

"So my question is why the BusinessCard has a mandatory ReceiverParty
in it, and why it does not have a DigitalCollaboration object? I
am here looking for a rational or definition objectives. It was
presumably added for a good reason/purpose, is that documented anywhere?"

(See original post for background detail to the question)