Does anyone know why I wouldn’t be able to select a project task in the “Case/Task/Event” field of the time tracking form? When I upload I get the error: “Invalid casetaskevent reference key 13458 for customer 39907.” even though 13458 is definitely a project task under 39907, and in fact there are OTHER timesheet records that point to that task!

Is that employee assigned on that specific project? (It's a project setting)

Figured it out. I guess you can’t put time towards a task marked complete. Hopefully there is a way to disable that!