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java.lang.NullPointerException: 	at com.collaxa.cube.engine.types.bpel.CXPartnerLink.copy(CXPartnerLink.java:246)	at com.collaxa.cube.engine.ext.wmp.BPELAssignWMP.performCopyTo(BPELAssignWMP.java:1151)	at com.collaxa.cube.engine.ext.wmp.BPELAssignWMP.__executeStatements(BPELAssignWMP.java:215)	at com.collaxa.cube.engine.ext.wmp.BPELActivityWMP.perform(BPELActivityWMP.java:199)	at com.collaxa.cube.engine.CubeEngine.performActivity(CubeEngine.java:3698)	at com.collaxa.cube.engine.CubeEngine.handleWorkItem(CubeEngine.java:1655)	at com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal(PerformMessageHandler.java:75)	at com.collaxa.cube.engine.dispatch.DispatchHelper.handleLocalMessage(DispatchHelper.java:217)	at com.collaxa.cube.engine.dispatch.DispatchHelper.sendMemory(DispatchHelper.java:314)	at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:5765)	at com.collaxa.cube.engine.CubeEngine.callbackPerformer(CubeEngine.java:1885)	at com.collaxa.cube.engine.delivery.DeliveryHelper.callbackPerformer(DeliveryHelper.java:845)	at com.collaxa.cube.engine.delivery.DeliveryService.handleCallback(DeliveryService.java:794)	at com.collaxa.cube.engine.ejb.impl.CubeDeliveryBean.handleCallback(CubeDeliveryBean.java:378)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)