All business transactions involve documents. Sometimes SAP R/3 creates documents automatically, but at other times you need to create documents yourself with a document entry screen. Document entry screens exist in all modules.
No matter what kind of document you want to create, you begin at the SAP R/3 home screen (refer to Figure 1.3 for a refresher). To access the purchase requisition document entry screen, follow these steps:
Choose Logistics, Materials Management (see Figure 3.1). Notice that some commands have a small arrow beside them, which means that choosing the command will display more choices on a submenu.
Choose Purchasing. The Purchasing screen appears.