(1) Subject to Rule 19.7, if a customer's order to purchase securities or trade in Futures Contracts is unlikely to be completed during a Market Day, the purchases (or trades in the case of Marginable Futures Contracts) may be debited to:—
(a) a customer's suspense account; or
(b) a general suspense account,
(2) Once the order is completed, the purchases (or trades in the case of Marginable Futures Contracts) must be booked to the customer's account.
(3) Orders must not be warehoused in the suspense account for more than 2 Market Days, unless under exceptional circumstances. In such cases, the Trading Member must document the reasons for the extension of time.