BPM OData Service - No SDO Dataobject for Entity Set

I am tring to follow steps mentioned in the below blog

http://scn.sap.com/community/bpm/blog/2013/10/18/bpm-odata-exploring-the-service

I am able to access the metadata of my task but i am not able to get the inputdata of my task.

I get the below error when i access

http://hostname:port/bpmodata/taskdata.svc/<taskid>/Context_RequestInfo

An error occured. 500 Internal Server Error. Log ID: C0000A407EAA044E0000000000810086

I get the same error when i access

http://hostname:port/bpmodata/taskdata.svc/<taskid>/Context_RequestInfo('<taskid>') ?

Checked Logs in LogViewer...

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[EXCEPTION]

com.sap.core.odata.api.exception.ODataApplicationException: There is no SDO DataObject for 'Context_RequestInfo' Entity Set.

at com.sap.bpm.odata.tm.BPMTaskDataODataSingleProcessor.getDataObjectForEntitySet(BPMTaskDataODataSingleProcessor.java:277

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I have attached the metadata xml.

I am trying to read Context_RequestInfo details like "id" and "status". Details of the entity is mentioned above.

Looking forward to your responses/solutions.

Thanks

Senthil