Updating Purchasing Category on Existing Approved Purchase Orders

Summary:

We have a business requirement to update the Purchasing Category on existing approved Purchase Orders.

This requirement is part of a purchasing category mapping change. We are introducing new purchasing categories that will replace the categories currently in use, so some existing approved POs need to be aligned with the new mapping.

We would like to ask:

1. Does Oracle recommend a standard approach for handling this scenario?
2. Is it possible to update the Purchasing Category on approved Purchase Orders using the REST API or any other supported mechanism?
3. For customers who have faced a similar requirement, what solution or best practice was adopted? How was the transition from the old categories to the new ones managed, especially for existing approved Purchase Orders?