of-flow: push-mpls-action different in config and operational data store

odl:
version.properties
org.opendaylight.controller.version = 0.1
org.opendaylight.controller.build.scm.version = 2fffd8cdb3ed75f478b900c677bb4d97e5e91c9c
org.opendaylight.controller.build.user = jenkins-controller
org.opendaylight.controller.build.workspace = **********
org.opendaylight.controller.build.timestamp = 1402444582255
org.opendaylight.controller.build.machine = **********

test: mininet 2.1.0 + ovs 2.0.0

steps:
1) PUT xml /restconf/config/opendaylight-inventory:nodes/node/openflow:${switch_idx}/table/${table_id}/flow/${flow_id}
(xml file f113.xml in attachment)

2) GET its operational state (for full details see f113odb.xml in attachment)
3) GET its config

4) seen difference
config:
<action>
<push-mpls-action>
<ethernet-type>34888</ethernet-type>
</push-mpls-action>
<order>0</order>
</action>

operational:
<action>
<push-mpls-action/>
<order>0</order>
</action>