How to hide specific currency code from BU user selection when creating PR (Sandbox)

Summary:

We would like to explore the option to hide certain currency code from the currency code LOV when user creating PR, and expected effect is these BU users won't be able to see or select this currency code to prevent human mistake.

Content (please ensure you mask any confidential information):

Normally when user creating PR, they will use PR request form (smart form) and select the currency code, rate etc. for the PR. However, we would like to know if we can hide certain currency code from the dropdown list (for example, assuming if we want to hide AMD currency) only for some BU, but to keep it available for other BUs is that doable?