Expense audit percentage, how it is calculated?

Summary:

We have configured an expense report audit selection rule with an audit percentage of 30%. We seek clarification on how this 30% is determined within the system.

Specifically, we would like to understand:

Does the 30% audit selection apply to reports approved on a daily, weekly, or monthly basis?

How is the universe of reports from which the 30% is selected defined? Is it based on submitted reports, approved reports, or another criterion?

Additionally, please provide any available documentation or guidelines related to the audit selection rule configuration and operation.

Thank you for your assistance.

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