Prerequisites
Before you complete the tasks in this section:
- Verify that the Localization Country Code field in the User Profile Revision program (P0092) is set to IT (Italy). 
- Verify that corresponding versions of the Standard Invoice Entry program (P03B11) and the PO - Localization Invoice Entry program exist in your system. 
- Run the Update Customer Sales program (R42800) for invoices that you need to associate to credit notes; the systems enables you to select in the Invoices Related to DN/CN form only processed invoices.