The document provides an overview of classic and enhanced invoicing architectures in Infor ERP LN 10.2.1, detailing their differences in structure, user functionality, and invoicing processes. It highlights features such as the handling of billable lines and tax information, comparing the complexities of classic invoicing to the streamlined processes of enhanced invoicing. Additionally, it discusses invoicing scenarios including invoicing from invoicing 360, sales orders, and shipment-based invoicing.