When the custom report is generated, user should be able to understand for what grouping whether Business Workflow or Site is used in generating the Custom report. In the URL, it mentions the Report name and the time frame which is selected for creating the report. Even when viewing the individual reports that make the custom report, it is not clear about the grouping selected.
It would be easier for the user to understand if the Group level and group name that is used be seen in the custom report.