How to enable audit for PO and Requisition?

Summary:

We are unable to find Purchase Order and Requisition is the LOV for Audit policies.

Please let us know where we can enable audit for them.

Content (required):

Manage Audit Policies task does not have Procurement in the LOV and there is no other area where PO and Requisition listed.

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

23C

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