Today we are going to learn about Service PO. I will describe step by step. Hope it will help you. T-code for PO creation is : Me21n. Step 1: Enter T-code: Me21n Create Purchase Order Screen open then from Order Type drop down list select order type like ZSER. Then choose vendor who provide services. From Org.Data tab provide Purchase Org, Purchase Group, Company Code. Choose Validity Start date for PO and End date.As like below : In Item Overview section provide Service Description, PO quantity, Unit, Plant ,Material Group. In Account assignment category provide- K (Service happened against cost center) and Item level provide - D (Service). As shown below. Step 2: Item Detail Services Tab: Provide Information about service , qty, Unit and Gross price. Step 3: Provide G/L Account & Cost center then from Item Detail section select Invoice tab and maintain Vat if applicable.