how to enabled invoice header flexfield in portal supplier

Summary:

how to enabled invoice header flexfield in portal supplier, in page "View invoices"

We have some flexible fields that store tax information that the vendor needs to be able to view.

A lot of inquiries are received from the provider for that information. That's why it's required to be visible on the portal

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Oracle Fusion Cloud Applications

23D (11.13.23.10.0)

Code Snippet (add any code snippets that support your topic, if applicable):