This feature is available from 8.3.6 and above

This system variable lets you choose whether you want to block final invoice approval if there is an open task on the job.

You have 3 settings to choose from:

1 – This is the default, it allows you to allow final invoicing approval whether there is open tasks on the job.

2 – Block the final invoice if there is an open task with resource bookings on the job

3 – Block the final invoice if there is an open task on the job.