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Vendor report add-on present totals aggregated (daily, monthly, yearly) reports for Shipments (bare uMarketplace) and Purchase Orders (Advanced PO add-on). That reports are very similar in look and feel as what you see in Admin > Reports > Sales
Totals data represent approximately the same information as vendor statements and payouts, i.e. it use statements configuration to calculate total payout.
You can access reports from Admin > Reports > Dropship Totals
Before first usage you need to recalculate Shipments and Purchase Orders totals data for existing records and refresh reports statistics.
You won't have to do this further. It will be done automatically for new Shipments and Purchase Orders.
Total reports have configuration options to control what information to display:
Vendor also can also see these reports in vendor portal.