Yes, it is in the Purchase Order. One of the primary ERP modules developed by SAP, SAP SD helps manage shipping, billing, selling, and transportation of products and services of an organization. This module is basically used to store customer and product data of an organization. SAP SD is important as it is responsible for managing customer relationships starting from raising a quotation to the sales order to the billing of a product or service. Also, when integrated with other SAP modules, SAP SD becomes a really handy module when it comes to managing sales and distribution holistically.