This document provides an introduction to the Dynamic Item Processor (DIP) in SAP. The DIP is used to process cost- or quantity-based data between cost accounting and sales. Key applications include resource-related billing, results analysis, quotations for service orders, and pricing for projects. The document covers business processes, technical processes, customizing, and enhancements using customer exits. It also describes differences between SAP releases and the conversion from the old to new resource-related billing functionality.