The term “booking” is the recording of the details related to shares/contracts owed to or delivering out of an account to the firm’s books and records. “Original Booking” is the first reasonably available time details of shares/contracts owed to or delivering out of an account are recorded to a firm’s books and records. Due to diverse post-trade processing models (e.g., batch, intraday, and real-time processing), firms should use the first reasonably available original booking time to reflect the eventTimestamp on a Post-Trade Allocation event/Option Post-Trade Allocation (MEPA/MOPA). Changes to CAT reportable attributes of an allocation after the original booking of shares/contracts are required to be reported to CAT as either an Allocation Amendment event or the cancellation of a Post-Trade Allocation event followed by a new Post-Trade Allocation event regardless if they occur pre-settlement or post-settlement. (also see FAQ U14)