This is a table of your payment records. You can manage your posted invoices from here.

Unpost: this button will unpost the payment and void the corresponding check that was issued. It will also reverse the vendor invoice balance. You would unpost a payment if you need to go back and make changes in the posted vendor invoice.
Void: voiding a payment will cancel the payment completely. You will then have to make a new payment to pay for the invoice.
Print/View: click this button to display the check info.
Paymt: click this button to view the payment details.

You now know how to use the Posted Payment List function!