I don't know how, but some of servers are not detected by SolarWinds as servers - IsServer property is "False" for them.
It may be due to polling method or any other reason, but looks that I should fix it by hand (around 10 items, not a week-long job).
How can I change IsServer Property? Two obvious, Edit Node Properties and Custom Property, didn't help.
Is read-only and only SolarWinds software or update on database can modify the value?