You have to use transaction F-90 or ABZON for posting the acquisition. Create the purchase order.If there is a purchase requisition, use it as a reference ( in Purchasing : Purchase order Create) Optimize your fixed asset management process with SAP Fiori Apps. Efficiently track, maintain, and maximize the value of your assets seamlessly. There is no legal requirement to carry out the purchase until a purchase order is created. This document provides an overview of the configuration steps needed to set up asset accounting in SAP. Step 1- Respective user will create the internal order in SAP System.