I can see some old alerts in SOI queue wiev with "null class".
When I try to clear them I'm getting error : Major alert on null of class : You do not have permission to clear this alert.
Release : SOI 4.2
Corrupt/no class alarms
The alarms need to be deleted from the DB.
First, build a select statement that selects all your alarms you can proceed with using the same query with a Delete.
Example:
If the following query returns the list of alarms affected (just an example, you could filter out a WHERE with other attributes, but the idea is to select all the alarms that cannot be deleted)
select * from Alerts WHERE loggedtime < '2021-10-29 13:05:12.273' and ModelElementID is not Null
--once alarms appear in your select statment then execute:
delete from Alerts WHERE loggedtime < '2021-10-29 13:05:12.273' and ModelElementID is not Null
Backup/Snapshot SOI/SOI DB first or Verify with Broadcom Support