How to update PO document type to refer workflow custom process.

How to update PO document type to refer workflow custom process.

1. Go Purchasing%Super%User responsibility
2. Setup-->Purchasing-->Document type
3. It will open new OAF page
4. If MOAC enabled, it would ask to select the Operating unit for which the settings needs to be applied.
5. Select the appropriate responsibility
6. In the webpage, we need to update following document types in order to refer custom process by PO approval workflow engine.
   ·         Purchase Order Standard
   ·         Purchase Agreement Blanket
   ·         Release Blanket