You can mark the job as completed but awaiting an invoice.
You may know that the job has already been completed by the trade when it's already in the 'Overdue' status.
Click a job with an overdue status and once you click the 'Invoice Pending' button, this will then move the job to the pending invoice status and then notify the trade that the job has already been completed but just awaiting the invoice.
By using advanced search, select 'Pending Invoice' and 'Apply' to see a list of all pending invoices and all other individual statuses.
By clicking 'Remind Trade to Complete' you can set reminders to trade to complete that job.