You need to extract a report with the Purchase Orders and their respective WBS Element data.
SAP S/4HANA Cloud
You can use the app Purchase Order Items by Account Assignment.
With the app Purchase Order Items by Account Assignment you can view Purchase Order Items grouped by their cost centers.
In this app you can find many filters, including WBS Element and WBS Element Name, after you have set the filter you can use the function Export to Spreadsheet.
Purchase Order; WBS Element; , KBA , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , Problem