During JBDS installation when searching for runtimes (installer page with label "Select Platforms and Servers") I specified directory with BRMS standalone server which contains EWP Server with preinstalled brms server. Installer added this server to Platforms/Servers table as Enterprise Web Platform version 5.1. But this server is not defined in Window > Server > Runtime Environments neither Servers view when JBDS is run.
It's possible to define this server manually afterwards via menu Window > Server > Runtime Environments