Duplicate Item Review by End User
Allow the End User to determine whether a duplicate expense entry is correct or not. With the current set up, the End User is unable to get similar looking expenses into the system and it's quite frustrating needing to wait for the Admin to review and approve. First they must notify the Admin that they are having this issue, then the Admin needs to approve the duplicate item, at which point the End User needs to return to the app to complete the data entry. This process is extremely inefficient.
There can be two layers of review for duplicates if the Admin prefers to review the expenses again during the approval stage.

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Jo Monaghan commented
It makes no sense that a standard user cannot review their own duplicates. Instead they have to go to the Admin user to do it for them. This is counterproductive.