Prepayments and open cash do not appear as line items on the aged creditors/aged accounts payable (detailed) report.
Although the total for the account is shown only the open invoices (and credit notes) are showing.
i.e. Where open cash the total does not agree with the detailed lines
This answer was correctCreated by13:08 20 Mar 2013
When running the purchase ledger/accounts payable report you can include on account payments with prepayment numbers. These will be detailed below the invoice lines when the Purchase ledger/accounts payable report is run in Detailed or Overview mode.
When the report is run as Aged, the on account values will not be displayed by default. There is a new setting in version 7.0 which now allows you to specify that the Prepayment Total be included as a separate column in the Aged report. This setting is found in Sales Ledger>>Setting>>Aged Limits and applies to both the Sales Ledger/Accounts Receivable and Purchase Ledger/Accounts Payable modules.