Thank you very much for your quick answers, 

I can already make sure that the invoice contains the total time recorded in the time log. Exactly as you describe. That is not a problem.

I would just like to see the individual data records from the time sheet as an attachment to the invoice.   How does that work?

Best regards

Tobias

Hi,

Please refer the blog:

https://www.cybrosys.com/blog/how-to-invoice-a-project-in-odoo-15#:~:text=To%20invoice%20these%20recorded%20timesheets,Line%20of%20the%20sales%20order

It covers everything from setting up project products to automating invoice generation from timesheets.

Hope it helps.

You do not need studio.  This is a standard function in Odoo.  You need the Project app and activate Timesheet. Create a product service type, and flag that product to create task in project. When you use that product in a sales order, it should automatic register a project and a task.  

When register times in the time sheet app, select the project and the task.  Before invoice, the registration of times must be validated. 

I think all is described here: 

https://www.odoo.com/documentation/16.0/applications/sales/sales/invoicing/time_materials.html?highlight=sales%20service