FS connector cannot be configured via CLI in EAP 6.1.0

18:23:55,291 INFO  [org.jboss.as] (Controller Boot Thread) JBAS015874: JBoss EAP 6.1.0.GA (AS 7.2.0.Final-redhat-8) started in 4334ms - Started 255 of 348 services (90 services are passive or on-demand)
18:26:58,825 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service jboss.modeshape.sample.external-sources.fsSource: org.jboss.msc.service.StartException in service jboss.modeshape.sample.external-sources.fsSource: org.modeshape.jcr.ConfigurationException: The configuration for the 'sample' repository has problems: ERROR: Error at externalSources.fsSource.readonly : Field value for 'externalSources.fsSource.readonly' expected to be of type boolean but was of type string
        at org.modeshape.jboss.service.SourceService.start(SourceService.java:112)
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746) [jboss-msc-1.0.4.GA-redhat-1.jar:1.0.4.GA-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [rt.jar:1.6.0_45]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [rt.jar:1.6.0_45]
        at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_45]
Caused by: org.modeshape.jcr.ConfigurationException: The configuration for the 'sample' repository has problems: ERROR: Error at externalSources.fsSource.readonly : Field value for 'externalSources.fsSource.readonly' expected to be of type boolean but was of type string
        at org.modeshape.jcr.ModeShapeEngine.update(ModeShapeEngine.java:598)
        at org.modeshape.jboss.service.SourceService.start(SourceService.java:110)
        ... 5 more