System Variable 523: Allow to Create Invoices on Non-billable Jobs

Use this System Variable to determine if invoices can be created on non-billable jobs.

This System Variable is enabled by default. When it is enabled, you can create invoices on a non-billable job in Jobs > Invoice. If it is not enabled, you will be prompted with the following error message:
The job is not billable and you can not create an invoice.
(System variable 523)

It may be necessary to perform a refresh when modifying System Variable values.