AHD20042:Cannot delete this Privacy Level

Document ID : KB000076490
Last Modified Date : 13/06/2018
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Deleting an option presented under the Privacy Levels for Support Automation gives an error: INVALID AHD20042:Cannot delete this Privacy Level. It is referenced by a role.  How can this be resolved?
Under the Service Desk Administration tab -> Security and Role mgmt -> Support Automation Access -> each record has a mapping to privacy levels. Delete those mappings and then delete the privacy level to avoid the error.