The Prebill Screen is listing Prebills that have been generated/printed and not Invoices. It is independent of the invoice posting/unposting and voiding process in Orion.  Normally if you have printed and checked off your Prebills each month you would delete them prior to doing the next month’s Prebills. There is only one Prebill record per Client-Matter on the Prebill screen at any given time. Its status or color does not change simply because you void the Invoice in Billing Manager.  The Prebill screen will indicate if you have generated a final Invoice by turning the record blue and by placing a check mark in the Invoiced column.  This just means an Invoice at one point was generated or printed. It does not tell you if it has been subsequently voided or posted. You have to look at Biling Manager to see that information. You will still see the Prebill on the screen until you delete it.