Hi, I just published a small module [1] that adds a new invoicing method to projects. It invoices a task using the number of hours computed in the Hours field for tasks in state done.
So it is a mix between existing "On timesheet" which invoices when the task is not yet finished and "On effort" which invoices by the estimated amount. Hope it's useful for other people too. Happy new year! [1] https://bitbucket.org/nantic/trytond-project_invoice_hours <https://bitbucket.org/nantic/trytond-project_invoice_hours>-- Albert Cervera i Areny Tel. 93 553 18 03 @albertnan www.NaN-tic.com