To reopen a bill that has been paid (i.e. to change its status from Paid to Ready), select the bill from the list and use the Reopen command from the context menu.

To reopen a bill from the payment screen, use the Reopen command from the Functions button context menu.

A confirmation prompt will appear.

If you decide not to reopen the bill, press Cancel. Press OK to confirm that you want to reopen the bill.

Reopening the bill will allow you to pay for or delete it.