CBSA published Customs Notice 19-17 updated the guidelines on how and where the BSF673 - House Bill, Cargo and Conveyance Manual Amendment Form - Post Arrival - All Modes is to be presented. The BSF673 is used in all modes by carriers, freight forwarders and/or their agents who are requesting a correction or deletion to a key data element in their electronic cargo or conveyance transmission post-arrival.  Key data elements that may be corrected with this form are: Conveyance Reference Number, Cargo Control Number, House Bill Number, House Bill Close Message, Customs Self Assessment indicator.  The form can also be used to correct Warehouse Arrival Certification and Conveyance Arrival Certification Messages.  For additional information on the use of the BSF673 can be found on the CBSA Website.