CMDB Duplicate CI Remediator fails to delete duplicate Serial Number records if cmdb_serial_number has Auditing turned onDescriptionCMDB Duplicate CI Remediator fails to delete duplicate Serial Number records, if cmdb_serial_number has Auditing turned on. The de-duplication task will be Closed Complete, but the records are still there. Out-of-the-box, the cmdb_serial_number table has audit=false in the Dictionary. Customers have set this to be audited, after which this problem happens.Steps to Reproduce This can be reproduced in Madrid, New York, and Orlando. In the sys_dictionary table, filter for Table=cmdb_serial_number and Type=Collection. By default, the "Audit" column is set to false. Change it to true.Create an example CI and Serial Number de-duplication Task: Insert a new Computer CI named "PRB1399417 test CI" with the following background script. var payload = { "items": [{ "className": "cmdb_ci_computer","lookup": [],"values": {"serial_number": "123456","name": "PRB1399417 test CI"},"lookup": [{"values": {"valid": "true","serial_number": "123456","serial_number_type": "bios"},"className": "cmdb_serial_number"}]}],"relations": []}var jsonUntil = new JSON();var input = jsonUntil.encode(payload);var output = SNC.IdentificationEngineScriptableApi.createOrUpdateCI('ServiceNow', input);gs.print(output); Open that new record in a form, and then open the Serial Number record."Insert and Stay" on the serial number form, to create a duplicate.Run the script again. This will create a new de-duplication task with short description "Duplicate records found in 1 class: Serial Number". Now for the Duplicate CI Remediator test: Open the de-ducplication task, and click Remediate, then "Use the Duplicate CI Remediator (Recommended)."Select the Recommended Main CI, and Click on Use Main CI button.On the Duplicate CI Actions, choose the Delete option and click Next.Click again on remediate. When completed, verify the De-Duplication Task. The comments include: "Action on duplicate CIs : Delete", "Reconciliation of duplicate CIs has been completed". The state is Closed Complete without any failure information, however, in the Duplicate Audit Results Related List, the 2 CIs are still existent and none of the 2 records has been deleted.Instead, all but the serial number record selected as the main should now be gone. WorkaroundThis problem has been fixed. If you are able to upgrade, review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to. The only workaround is to temporarily turn off auditing in the Dictionary for the [cmdb_serial_number] table.Related Problem: PRB1399417