In order to report time you need a service product assigned with a time-based Unit of Measure (usually hours). The product can be assigned to an employee directly, to a task or to a sales order line. The product must have the appropriate setting under "Track Service".

Further reads:

- https://www.erponline.vn/en/documentation/user-manuals/89-human-resources-management/231-attendances-and-timesheet-management

- https://www.odoo.com/documentation/user/9.0/sales.html

So it is recommended to make yourself familiar with the proper set-up for services.