Audit Cancelled Reqs that were tied to an open Purchase Order at time of cancellation

Summary:

Is there a way we can write a query/check an audit file that contains history of all requisitions that were cancelled that were already tied to an open Purchase Order? We are finding that users are cancelling Reqs after the PO had been created and we need a way to audit this.

Content (please ensure you mask any confidential information):

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

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