Hi @kedarik,
well, the docs could be more specific, but this sentence
If your organisation allows the usage of additional characters (ex.: special characters), the ProcessEngineConfiguartion propery
generalResourceWhitelistPatternshould be set with the appropriate pattern in the engine’s configuration file.
means the either bpm-platform.xml for Tomcat, WebSphere, WebLogic or settings.xml for Wildfly, JBoss or a configuration bean for Spring boot.
Hope this helps, Ingo