How can we make Purchase Order number mandatory field for invoice submission?

Summary:

We would like to only allow the invoice submission for invoices with the PO number correctly filled.

Content (required):

We would like to only allow the invoice submission for invoices with the PO number correctly filled.

Is there a native way to make this field required or do we need to use a sandbox to implement this change?

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

23B

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