Hi,
Please check the below note that will help you to check the report. Please dont follow the deletion step as this note is to delete the KM but they have shown how to check the KM after deletion.
1864103 - Deleting a Knowledge Management (KM) resource fails with the error message 'ORA-01427: single-row subquery returns more than one row openSQLExceptionCategories: []'
Thanks
Rishi Abrol