Setting 'level-range' logging filter fails with "JBAS011539: Log level undefined is invalid." in EAP 6

Issue

• level-range logging filter should work with the setting like this, under a logger or a handler element in the logging subsystem section of standard.xml or domain.xml.

            <periodic-rotating-file-handler name="FILE">
                <filter>
                    <level-range min-level="DEBUG" max-level="WARN"/>
                </filter>
                ...
            </periodic-rotating-file-handler>

Though it doesn't work and find the following error message in the boot.log.

12:33:03,753 ERROR [org.jboss.as.controller.management-operation] JBAS014613: Operation ("add") failed - address: ([
    ("subsystem" => "logging"),
    ("periodic-rotating-file-handler" => "FILE")
]) - failure description: "JBAS011539: Log level undefined is invalid."