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CMP optimisticUpdate

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Hi all,
we have a small problem in our project here. We are using Websphere 5.0.2 Enterprise (incl. Fix pack 2) and CMPs 2.0. In our development environment we are testing our application with the test environment of WSAD in the same version. There everything works fine.
When we now deploy our application to our test environment we get the following error

java.rmi.NoSuchObjectException: com.ibm.ws.ejbpersistence.utilpm.OptimisticUpdateFailedException: PMGR6025E: An attempted update under optimistic concurrency control failed because another application has changed the bean data in the datastore since this transaction read it. Either it changed a predicate field value or removed the bean itself.
at com.ibm.ejs.container.ContainerManaged2_0BeanO.store(ContainerManaged2_0BeanO.java:246)
at com.ibm.ejs.container.ContainerTx.flush(ContainerTx.java:1548)
at com.ibm.ws.ejbpersistence.beanextensions.ConcreteBeanStatefulInstanceExtensionImpl.flush(Unknown Source)
at com.ibm.ws.ejbpersistence.beanextensions.ConcreteBeanStatefulInstanceExtensionImpl.executeQuery(Unknown Source)

IBM web page says this error should be fixed with Fix Pack1. Do you have any idea what else could cause this prob ? (in both cases only one client was accessing the application)
Thx in advance
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