Yes. To see who has voided an Invoice, go to the Billing Manager and set your Invoice Filter for the proper Invoice Date Range and choose to show Voided Invoices. Locate and highlight the Invoice and then choose TOOLS, View Audit Trail. Once the Audit Trail is displayed, sort it by Date. The most recent entry will be the entry created when the Invoice was voided. Check the name in the Person field of that record, and that will tell you who voided it.