You can delete a common report only if you have full administrative permission for the table to which it belongs.
To delete a common report:
In the table bar on any application page, click the table containing the report you want to copy. Within the menu that appears, select Customize --tablename-- Table > Reports.
Within the list of reports, locate the report you want to remove
and click the delete icon (
)
in the rightmost column of the table.
In the confirmation prompt that displays, click Delete.
Note: When you delete a report, all subscriptions to that report are also deleted.