CBP guidance: Do not use unknown Manufacturer Identification Number on ISFs

US Customs (CBP) has just issued guidance regarding the use of the unknown Manufacturer Identification Number (MID) data to report a manufacturer (or supplier).  The use of the unknown MID is only allowed to be reported for ACE entry summary filings.  Pursuant to the applicable regulation, 19 CFR 149.3(a)(5), the importer must report the identity of the actual manufacturer (or supplier) at the line item level for Importer Security Filing (ISF).