Duplicate expense report receipt verification

We have been using Oracle Fusion Public Cloud Financials (AP, FA, Cash Management, Expenses, and GL modules) for the past five years.Our finance business partner team audits expense data daily, and one resource is fully dedicated to auditing expense reports.

Below is one of the scenarios illustrating how the audit is performed:

Assume I am in ITS department 606, and one of my colleagues is in Finance department 123. We went to lunch together, and now both of us are charging our respective cost centers for the lunch expense.

Since we are in different departments with different managers, each manager is able to approve their respective employee's expense report.