If you are missing a receipt for a transaction, you can click on the transaction on your Ramp dashboard. To dismiss, please navigate to the transaction or click on the 'Missing Items' banner from your 'My Ramp' tab. Once the transaction is open, please scroll and locate the vertical dots, then click on 'Request Policy Exemption', as shown below:
From there, you can fill in a memo to your manager or admin to let them know about the lost receipt. They can then dismiss the requirement for that transaction.
As an admin or business owner, you can dismiss a receipt requirement by clicking on the transaction and clicking 'Dismiss Requirements', as shown below: