Is there a way to default PAY ALONE for expense report invoices?

Summary:

Is there a way to default PAY ALONE for expense report invoices?

Content (required):

As we know, PAY ALONE can be default on the supplier site. Our users want to pay expense report invoices alone, but employee is not supplier in system. So is there a way to default PAY ALONE for expense report invoices?

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

23C

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