Data access through the OLAP API

We have created a number of Cubes from the AWM, and access the cubes from a web based application through the OLAP API. The cubes have both base measures and custom measures. Custom Measures are computed by creating the source object for given Formula Expression. The application works fine for a single user, but when a same cube is accessed concurrently by multiple users, we get the TransactionalObjectInvalidException when we call the MdmMeasure.getSource() function for the custom measures.
Since each individual users have individual contexts and the static methods are properly sunchronized, we havent not been able to trace this error so far. The exception is thrown by oracle.olapi.data.source.ImmutableDefinition.checkValidity() API method. Error Trace is:
oracle.olapi.transaction.TransactionalObjectInvalidException
at oracle.olapi.data.source.ImmutableDefinition.checkValidity(Loracle.olapi.transaction.Transaction;)V(ImmutableDefinition.java:40)
at oracle.olapi.data.source.SourceDefinition.getCurrentTransaction()Loracle.olapi.transaction.Transaction;(SourceDefinition.java:206)
at oracle.olapi.data.source.SourceDefinition.getSource()Loracle.olapi.data.source.Source;(SourceDefinition.java:320)
at oracle.olapi.metadata.mdm.MdmSource.getSource()Loracle.olapi.data.source.Source;(MdmSource.java:141)
Any help will be highly appreciated.
--Saajan

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