If you receive one of the messages below after transmitting WACM, you will have fulfilled your obligation to transmit the warehouse arrival.

ER 01 – No CCN on file
ERC 02 – No transaction on file
ERC 34 – Request ID already in arrived Status

Below is a list of other responses you may receive. 

Source: https://www.cbsa-asfc.gc.ca/eservices/error-erreur-eng.html