The po is generated. Create the purchase order.If there is a purchase requisition, use it as a reference ( in Purchasing : Purchase order Create) The document outlines the procedure for creating an asset purchase order (ZASP document type) in SAP. It involves accessing transaction code ME21N. The following article shows you how to automatically copy texts to the SAP purchase order header. You should not have a user with both Purchasing and Receiving role. Computer Systems Design and Related Services.