Correlation for asynchronous system via websphere MQ from a BPEL client

I could able to find samples for correlation in BPEL while invoking asynchronous webservices.
Query 1. Are there any samples for Correlation while invoking asynchronous system via websphere MQ from a BPEL client?
Eventhough I could see some BPEL samples under "\bpel\samples\tutorials", there is no documentation corresponding for each scenarios.In the BPELdeveloper manual, it has been mentioned to see the documentation available in the corresponding directories for instructions on running these tutorials.But there are no such documentations in it.
Query 2.Can anybody suggest on this regarding documentation especially for the 113.ABCARouting tutorial.

I understand the MQadapter inconsistency is my problem. Besides that below I have presented some more details regarding what I configured in BPEL...
MQ adpater(Synchronous Get msg from MQ and send reports) ----> receive1---->Assign1----> Invoke1------->MQ adapter(Asynchronous send msg to MQ and get reports) -----> Receive2 ----> assign2 ---->reply1 ---->MQ adpater(Synchronous Get msg from MQ and send reports) .
The MQ adapters has been configured for opaque schema. I was constructing the above flow step by step..(Initially with an MQput adapter instead of asynchronous mq adapter and ensured correct operation of messages). Then modified with asynchronous adapter and posted a message. Now the message got strucked at assign1 itself. The error instance in Assign_1 is below...
<selectionFailure xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"><part name="summary"><summary>empty variable/expression result.
xpath variable/expression expression "/ns3:opaqueElement" is empty at line 75, when attempting reading/copying it.
Please make sure the variable/expression result "/ns3:opaqueElement" is not empty.
</summary>
</part></selectionFailure>
Sorry for the paining you .....I may be wrong at some point as I am new to this IT field.

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