A/P Invoice Vs. A/P Reverse Invoice

Hi Everyone,

I have noticed that both A/P Invoices & A/P Reverse Invoices share the OPCH table in common. How is it possible to distinguish these two document types from each other given that they are both stored in the same table? Is there a flag which indicates the kind of document stored in OPCH?

Any help will be greatly appreciated.

Kind Regards,

David