It shall be unlawful for any person to be associated with a futures commission merchant as a partner, officer, or employee, or to be associated with an introducing broker as a partner, officer, employee, or agent (or any person occupying a similar status or performing similar functions), in any capacity that involves (i) the solicitation or acceptance of customers’ orders (other than in a clerical capacity) or (ii) the supervision of any person or persons so engaged, unless such person is registered with the Commission under this chapter as an associated person of such futures commission merchant or of such introducing broker and such registration shall not have expired, been suspended (and the period of suspension has not expired), or been revoked. It shall be unlawful for a futures commission merchant or introducing broker to permit such a person to become or remain associated with the futures commission merchant or introducing broker in any such capacity if such futures commission merchant or introducing broker knew or should have known that such person was not so registered or that such registration had expired, been suspended (and the period of suspension has not expired), or been revoked. Any individual who is registered as a floor broker, futures commission merchant, or introducing broker (and such registration is not suspended or revoked) need not also register under this paragraph.