Create an email notification for when a policy is due to expire in 1 month

I need to create a new email notification for when a policy is to expire in 1 month.

Please can anyone help.

I have gone to notifications, selected the table sn_compliance_policy

Send when  - Event is fired

Not sure of the event name

Condition - Valid to is less than 1 month before valid to.

Am i doing anything wrong here?

Thanks

HP