Configuring An Automatic Purchase Order in the Sales System 
Configuring An Automatic Purchase Order in the Sales System
Use
In this section you will find the settings required to generate a purchase order automatically from the purchase requisition for the sales order.
Prerequisites
A purchasing info record must exist for the material (see
Maintain Material Master).In order that a purchase order can be created automatically, a workflow must be set up in the sales system (see
Configuring Workflow for Automatic Purchase Order/Purchase Order Change).Procedure
Check the item category ALES. In Customizing for Sales and Distribution select Sales ® Sales Documents ® Sales Document Item ® Define Item Categories.
The Create PO automatic. indicator must be set. For third-party schedule lines, not only a purchase requisition but also, when the sales order is being saved, a purchase order is generated automatically via the workflow in the background.