Automation failing in OSM clustered env

 We have OSM 703p6 installed on a Weblogic 10.3.1 cluster in our PreProd environment. 

Scenario is - automation plugin is waiting for a response from the downstream system. OSM correlates the responses using JMSCorrelation ID.

Code and design works fine on a non-clustered environment. But on clustered environment OSM is not able to correlate 30% of responses from the downstream system.

Here is the error what we see in the logs - 

SBL1-41251321 [ERROR] - 2012-05-30 14:51:10 ClusterMessageHandlerBean:? - Failed to process cluster request for order ID [3100]
java.lang.IllegalStateException: unread block data
at java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2376)