How to Enable Project Fields on AP Invoice Lines

Summary:

I have a basic question regarding the setup in Oracle Cloud.

When entering AP Invoice Lines, the Project Fields section does not appear.
I would like to confirm what setup is required in Payables and/or Project Portfolio Management (PPM) to enable project-related fields on the invoice line.

From what I can see, there does not seem to be a specific setup in Payables that controls this behavior.
Does this mean that the required configuration is on the PPM side, such as enabling project costing integration or expenditure types?

If anyone could advise which setup(s) must be enabled so that Project fields become available during AP invoice entry, I would greatly appreciate it.