Importance of Timesheet Audit trail report in terms of DCAA compliance:

What does this setting do?
The timesheet Audit Trail report provides a complete history of all actions performed on a timesheet, either from the time it was created or from when it was submitted, depending on which value is selected for the Log Timesheet Changes option. The report tracks all initial entries and changes, including change comments, if applicable. When DCAA compliance is enabled, this report is made available in all permission profiles that allow access to both administrative tasks and reports.

What DCAA requirements does this setting meet?
Enabling this setting helps meet the following DCAA requirement, a verifiable audit trail process is in place that collects all initial entries and subsequent changes.