(DM) - a posting medium used for bank statement reconciliation that secures a transaction that has occurred but has not found its way into the cash disbursments journal (CDJ) because a check has not been written. An internal memorandum used by banks to decrease the fund balance in an account containing a brief explanation of why the account was decreased. A duplicate copy of the memorandum is forwarded to the customer with the regular bank statement.
A bank form (or memo) used by a bank to explain a deduction to a depositor's bank account. (Note that the term "debit memo" may seem reversed to the depositor--- this is true because the transaction is a debit to the bank.)
Billing a customer again. A debit memo would be required, for example, when a customer has made a payment on their account by check, but the check bounced.