Add Custom Validation on Payables Invoice Header

Summary:

We have a requirement from one of our customer where when saving the invoice header, one of the 3 following fields must be populated, and ONLY then the user should be able to SAVE the changes

1.Identifying PO
2.Requestor
3.Pre-approved (on additional information tab)

Would request some help or guidance to achieve this functionality. Any help on this will be highly appreciated.

Content (please ensure you mask any confidential information):

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

Oracle Fusion Cloud Applications24C (11.13.24.07.0)

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