(a) Nothing stated in these rules shall be construed to prejudice the right of a broker or dealer to any claim against the debtor's estate, or the right of the trustee to make any claim against a broker or dealer, with respect to a commitment of the debtor which was outstanding on the filing date, but (1) which is not described in §300.300(c), or (2) which, although described in §300.300(c), does not meet the requirements specified in §300.301 or was not closed out of completed in accordance with §300.302 or was not reported to the trustee in conformity with §300.303 or was not supported by appropriate documentation.

(b) Nothing stated in these rules shall be construed to prejudice the right of a broker or dealer to a claim against the debtor's estate for the amount by which the money difference due the broker or dealer upon a buy-in or sell-out may exceed the amount paid by the trustee to such broker or dealer.