Jboss-cli cannot write Read only property in EAP6

Issue

jboss-cli cannot write to resource adapter property

/profile=demab/subsystem=resource-adapters/resource-adapter=wmq.jmsra-7.1.0.2.rar->1/connection-definitions=MqChannelOfpub/config-properties=port:write-attribute(name="value",value=1420)
{
    "outcome" => "failed",
    "failure-description" => {"domain-failure-description" => "JBAS014639: Attribute value is not writable"},
    "rolled-back" => true
}