This X12 transaction set enables ocean freight participants to cancel existing space bookings. Shippers, freight forwarders, or their authorized representatives send booking cancellations to ocean carriers or their agents to withdraw or terminate previously confirmed cargo reservations. The transaction is typically initiated when cargo plans change, shipments are postponed, or bookings are no longer needed. The B1 segment (Beginning Segment for Booking or Pick-up/Delivery) identifies the booking reference and party details, while the Y5 segment (Space Booking Cancellation) communicates the cancellation request itself. Optional V9 segments (Event Detail) can document up to ten related events or reasons associated with the cancellation, providing context for the carrier’s records.

Consider a scenario where Acme Manufacturing, having booked container space with Pacific Shipping Lines for an export shipment, discovers that its customer has delayed the order by three weeks. Acme’s freight forwarder sends an X12 303 to Pacific Shipping Lines containing the original booking number in the B1 segment and marking the reservation as cancelled in the Y5 segment. If relevant, a V9 segment might note that the cancellation was due to a customer production delay. Pacific Shipping Lines receives this transaction, releases the container slot for other bookings, and confirms the cancellation back to Acme’s forwarder, freeing both parties from the original commitment.