The following is available  in its entirety on the Canada Border Services Agency website.
The purpose of this customs notice is to clarify and communicate the CBSA’s policy on the issuance of Risk Assessment Notices in the marine mode.
The CBSA is currently updating its marine Electronic Commerce Client Requirements Document and the Advance Commercial Information webpage to align the requirements to the information already stated in Memorandum D3-5-1, Marine Pre-load/Pre-arrival and Reporting Requirements.
In cases where the cargo is loaded off-shore (non-U.S.) the CBSA has up until the EDTL to review the submitted primary cargo data and applicable house bill or supplementary cargo transmission(s). If the carrier does not receive a risk assessment notice (coded message), the cargo may be loaded at or after the EDTL.