Administrators can delete an update set only when it is not the current update set and it is empty (no sys_update_xml entries are associated with it). For example, after merging update sets, you might want to delete the original sets. This function is restricted by an access control rule (ACL) on the Update Set [sys_update_set] table.

When you try to delete an update entry, a warning message appears. Click OK to confirm the deletion.