Unit Quantity Code standardization: mandatory SQC declaration for EDI filings or bill of entry submission barred. Standardizing UQC for EDI declarations requires adding Info_Type CHR with Info QFR SQC in the Single Window Table; Info_MSR must carry the quantity in the standard UQC and Info_SQC must specify the actual UQC validated against the tariff code directory in ICES. The SQC must be separately declared even if identical to the commercial UQC on the invoice, and SQC declaration is mandatory from 18 February 2019, without which Bill of Entry submission will be blocked.