What happens to a child Notification Server after a replicated resource is deleted from it?
ITMS 8.x
Only Configuration and Management Items act in this way. Replicated resources, Events, and Security objects (such as Security Roles and privileges) do not.
Examples of Configuration and Management Items would be; Reports, Policies, Tasks, Filters, Targets.
So, if the user at the parent NS creates a new report, and replicates this report down the hierarchy, then later the user at the parent NS deletes this report, the next time Item replication via hierarchy is run, it will delete this report at all child servers. This is expected behaviour.