What does QuickBooks Online do if the service/task wasn't specified when invoicing for billable time?

When invoicing for billable time in QuickBooks Online, if no specific service or task has been specified, the system defaults to using its pre-established default service item, typically called "Hours." This ensures that even if specific details of the service are missing, there is a placeholder that allows the billable time to be accounted for on the invoice. It streamlines the invoicing process by providing a standard item in the absence of specific information, facilitating efficient billing practices.

The other choices relate to scenarios that do not occur within QuickBooks Online. For instance, the program does not prevent the addition of time to an invoice nor does it display unrelated error messages when time entries lack specific service items. Instead, it smoothly transitions to use the default option to maintain functionality and user flow.