If you would like the detailed information for a service call to display on an invoice, there is a setting to do so.
The steps to activate this setting are:
1) Go to Settings
2) Under Invoice Settings, select General Settings
3) Under Display Settings, Select "Yes" for Display Job Details in Invoice.
Once the setting has been activated the invoice will display the time the technician said they were on their way to the appointment, the time the technician said the appointment was completed and the Service Call Description. See Screenshot below for illustration of Job Details in Invoice.