I received rejection 'V72: Client Supplied Request ID-Cannot cancel, cargo has arrived'. What does it mean?

I received rejection 'V72: Client Supplied Request ID-Cannot cancel, cargo has arrived'. What does it mean?

Reason: Post arrival cancellation or change made on a house bill that is already tagged as either Reported or Arrived

Resolution: If changes will be made on non-key data elements, house bill can still be resent as Post-Arrival Amendment with applicable Amendment code or Amendment Code 60 if not specified.

If changes are on key data elements like HBL CCN, Previous CCN must be done by completing Form BSF673 to be submitted to CBSA.