The Posted Transactions list provides a complete history of the customer's invoices. From this view you can:
Open an invoice - right-click on the invoice and select View Invoice.
See how payments and adjustments are allocated on a selected invoice - right-click on the invoice and select View Settlement. See Viewing Settlements.
View charges on an invoice by Invoice Category - right-click on the invoice and select View Charges by Invoice Category. See Viewing Charges by Invoice Category.
Knowledge Articles > Desktop Client User Guide > Accounting > About Managing Account Balances > Working with the Balances Tab to Manage Individual Accounts > Viewing the Account Balance