Autopost numbers are unique numbers which are assigned to specific general ledger accounts in the Maintain Account Descriptions program. Autopost numbers are used by the system to identify the accounts to be posted to by specific applications. Certain GL accounts such as Cash, Accounts Receivable, and Discounts Taken are posted to automatically by the Accounts Receivable System. The system uses autopost numbers to identify these "control" accounts (please see the Autopost Numbers Reference section of the GL documentation). The autopost numbers for the control accounts that are posted to by the AR system must be set up before the user begins to process AR transaction.