The forwarder owns this deadline on every export booking: shipper detail has to be chased, checked, and filed with the carrier before it passes, or the desk is looking at late-SI amendment charges, a delayed draft BL, and possibly the loss of the planned sailing where the documentation cut-off is tied to loading approval. Because each carrier publishes its own cut-off per vessel and those deadlines move when the schedule slips, the standing decision is which bookings to escalate before the cut-off lands. Carriers group this deadline under the documentation cut-off, and it is also called the BL cut-off. It is not to be confused with the CY cut-off, the physical deadline for the loaded container to gate in at the terminal yard.
Glossary
SI Cut-off
The carrier's deadline for submitting the final shipping instruction (SI): the full set of bill of lading and shipment details the carrier uses to draft the BL and build the manifest.