Issue when I tried to clear an alarm on a device

Issue when I tried to clear an alarm on a device

Hello,
 
I got an issue when I tried to clear an alarm on a device
Error message : webclient.fault.alarm.clear.status.failure
 

The diffrence I can see on this alarm is there is a long Event History behind regarding other alarms I clared for the same device.
 
Note : it is working for other devices.
 
Please, let me know what I can do to remove this on as I cannot also delete, I got : Problem in deleting alarm!
Thanks for your help
Philippe

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