Before running the SPMAT Piping MTO report, you need to create a catalog filter.
Catalog Filters\CustomReport\Piping\SPMATReport as shown:
From any environment, click Tools > Run Report, or from a new or existing "Spreadsheet report" Snap-in in the Drawings and Reports environment, right-click and select Create report.
Select the Catalog Reports tab and navigate the above-mentioned hierarchy (Reports > Types of Reports > SPMaterialMTO) to select one of the four reports:
Click Run. Select the desired Unit of Measure:
Click Finish. The report will be generated and displayed.