Configure expense report potential duplicates behavior

We have a request to allow certain expense reports to be auto-approved. However, during testing, we observed that users can still submit duplicate expense reports by simply click proceed when the warning duplicate pops up. hence, the duplicate report will be approved and this goes against our business requirements, causing compliance issues.

Is there a way in the system to configure how the system handles potential duplicates in an expense report? Or, what is the best approach for this kind of scenario?