Steps:
1. Add a flow with match = ipv4 destination and ethernet type and instructions = apply action with push pbb action. Flow gets added correctly.
2. Update the flow.

Commit operation for step 2 with IllegalArgumentException.
2014-01-16 15:25:18.744 IST [pool-21-thread-3] ERROR o.o.c.m.s.c.i.service.TwoPhaseCommit - Transaction: DOM-12
Request Commit failed
java.lang.IllegalArgumentException: Supplied composite node is not configurational.
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:92) ~[bundlefile:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations.checkConfigurational(YangDataOperations.java
:51) ~[na:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations.merge(YangDataOperations.java:30) ~[na:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations._mergeMultiple(YangDataOperations.java:79) ~
[na:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations.mergeMultiple(YangDataOperations.java:209) ~
[na:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations.mergeContainer(YangDataOperations.java:183)
~[na:na]
at org.opendaylight.yangtools.yang.util.YangDataOperations.merge(YangDataOperations.java:42) ~[na:na]
at org.opendaylight.controller.sal.dom.broker.impl.SchemaAwareDataStoreAdapter.mergeData(SchemaAwareDat
aStoreAdapter.java:159) ~[na:na]
at org.opendaylight.controller.sal.dom.broker.impl.SchemaAwareDataStoreAdapter$NormalizedDataModificati
on.mergeConfigurationData(SchemaAwareDataStoreAdapter.java:318) ~[na:na]
at org.opendaylight.controller.sal.dom.broker.impl.SchemaAwareDataStoreAdapter$NormalizedDataModificati
on.mergeConfigurationData(SchemaAwareDataStoreAdapter.java:289) ~[na:na]
at org.opendaylight.controller.md.sal.common.impl.AbstractDataModification.putConfigurationData(Abstrac
tDataModification.java:70) ~[bundlefile:na]
at org.opendaylight.controller.sal.dom.broker.impl.SchemaAwareDataStoreAdapter.prepareMergedTransaction
(SchemaAwareDataStoreAdapter.java:176) ~[na:na]
at org.opendaylight.controller.sal.dom.broker.impl.SchemaAwareDataStoreAdapter.requestCommit(SchemaAwar
eDataStoreAdapter.java:115) ~[na:na]
at org.opendaylight.controller.md.sal.common.impl.service.TwoPhaseCommit.call(TwoPhaseCommit.java:76) [
bundlefile:na]
at org.opendaylight.controller.md.sal.common.impl.service.TwoPhaseCommit.call(TwoPhaseCommit.java:31) [
bundlefile:na]
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [na:1.7.0_21]
at java.util.concurrent.FutureTask.run(FutureTask.java:166) [na:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_21]
at java.lang.Thread.run(Thread.java:722) [na:1.7.0_21]

I tested the scenario using OpenflowpluginTestCommandProvider. The command "addMDFlow openflow:5 f10" when executed twice resulted in the above exception. The 2nd execution should have resulted in update operation.