Inventory Summary Valuation Report

When I run the Inventory Valuation Summary Report and sort by Item, I need to have the total quantity shown in the report as well as the monetary value which is there already.

I have tried to add the field TotQty which is in the detailed report, but the field is unavailable in the ReportData pipe.

How do I add this field to the Summary Report.

Your assistance would be appreciated as our Auditors insist that the Qty be shown in the report.