Every invoice that has at least one non-draft credit note or refund receipt, with its returns nested under it, the net of the two, and subtotals and totals as the page prints them.Mirrors /owner/reports/report/invoice_return_cross_reference and backs the Invoice-Returns Cross-Reference card on the Sales tab, whose own request is group_by=Invoice¤cy=All.Refused, not ignored: show_report, summary, is_summary, quick, ext, auto_csv, csv_confirmed, threshold_limit, graphType, no_graph, hide_columns, date_from, date_to, data[...], and any custom-field filter. Each is a 400 naming the parameter.Bounded: a request matching more invoice-return pairs than this deployment assembles is a 400, never a partial report.