Electronic Duty Payment Ledger records customs duty payments with required fields including reference numbers and CIN timestamp. Form ECL 4 prescribes the Electronic Duty Payment Ledger (Cash) to be maintained on the Common Portal, capturing payment challan numbers, payment reference numbers, date/time of CIN generation, ICEGATE reporting date, descriptive identifiers of liabilities, Debit/Credit transaction type, amounts and running balance in Part I, and allocation to major/minor heads with totals in Part II; notes require inclusion of bank reference numbers, document identifiers where applicable, recording of application or demand identifiers in description, separate recording of refunds or debits, and that deposit date/time equals CIN generation reported by the bank.