The Project Invoice module adds invoice methods on project. The methods are:
- Manual: Tryton doesn't create any invoice.
- On Effort: The invoices are created based on the Effort hours for all children works with 100% progress.
- On Progress: The invoices are create proportionally to the Progress of the Effort hours of each children work.
- On Timesheet: The invoices are created based on the timesheets encoded on all children works.