Thanks for the reply. That was the first thing I looked at, and there are no unbilled invoices or unbilled time (those are the only two reports that come up for me) for this former employee. Other former employees deleted (made inactive) just fine.
Were you able to find a solution? I have time going back to 2009 and prior that I need to remove the billable checkmark for. Not going to happen if I have to do it one at a time for every old employee.
Thank you for getting back here in the Community, @jillroth.
Currently, the workaround to remove billable checkmark for the employees is the steps provided by, @MariaSoledadG.