ANSI X9.20-1998 pdf download American National Standard for Financial Services X9.20 -1998 (revision of X9.20-1990) Securities Institutional Delivery System
1. Scope
1.1 Scope For purposes of processing security transactions through the National Institutional Delivery System operated by a Clearing Corporation or Depository, this standard describes the formats to be used by all institutions professionally engaged in the securities business, in particular, banks, brokers, investment managers and money managers. The standardized input format will provide for more efficient computer to computer processing for all parties involved in a securities transaction.
2. Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standard listed below. X9.6-1991 CUSIP  The Securities Identification System developed by the Committee on Uniform Securities Identification Procedures of the American Bankers Association.
3. Definitions
Terms or abbreviations used in the specification may not be familiar to all readers. The following definitions will help to understand the specification.
account number: The account number assigned by the interested party.
interested party:
account type: The type of account in which the transaction occurred.
They are:
l Cash
l Short
l Margin
l Other
accrued interest: The amount of any accrued interest associated with a debt transaction.
additional party: Record 3 enables more interested party numbers than the two that ID number: were previously allowed. See description for interested party.
agent bank: The number which identifies the agent bank.
This may be the affirming party to the transaction.
agent internal: The account number assigned by the agent bank by which it identifies its account number: client.
alternate currency Rate used to show difference between currency security is listed in and conversion rate: currency of settlement.
alternate currency: The currency code that a security is listed in when other than currency ISO code: of transaction.
alternate currency Transaction net amount in the listed currency when trade settlement is in a net amount: different currency
amortized/accreted Prorated outstanding principal balance on mortgage transactions to original
factor: principal balance expressed as a decimal.