How to Change Display Type of Standard EXM_ADDITIONAL_RATES Field on Expense Page?

Hello Community,

We are working on enhancing the user experience on the Oracle Fusion Cloud Expenses page. We have a requirement to change the display of the standard EXM_ADDITIONAL_RATES field (which uses custom values on a standard lookup) from its current "multi-choice selection" presentation to a more controlled input, specifically a simple dropdown (List of Values) or a Radio Button Group.

EXM_ADDITIONAL_RATES appears as part of standard functionality of Mileage Expenses and additional rates can be defined via Mileage Policy.

In order to avoid multiple rates applied, Client requires this field to be represented as LOV or Radio-button.