Electronic origin data exchange enables automated CoO validation and ledger debit, triggering negative acknowledgments for mismatches. Electronic origin data exchange now supplies electronic Country of Origin data from Korea for Bills of Entry; importers or customs brokers must declare correct unit quantity code and quantity in BE_item and provide the CoO number with specified single window fields per the ICES advisory annexure. ICES will auto debit eCoO quantity from the CoO certificate ledger and issue a negative acknowledgment where declared quantity exceeds ledger balance or an incorrect UQC is declared, with declared details visible to assessing officers. The same steps apply to old certificates and the notice functions as a standing order.