"I have voided invoices of some permanent fee timesheets but these timesheets are still appearing in Create Sales Invoices. How do I delete these timesheets?"
After you have voided each invoice you will need to go into the timesheet’s assignment and click on the ‘Time & Expense sheets’ tab. Cancel the timesheet but do not click update just go back to the assignment entry screen.
Then click the red ’X’ icon to delete the assignment from the list.