Creating new monitoring probe failing with internal server error after upgrading Red Hat Satellite Server to v 5.6

Issue

• Creating new monitoring probe failing with internal server error after upgrading Red Hat Satellite Server to v 5.6

In catalina.out can see following error messages

2013-10-30 15:19:15,899 [TP-Processor16] ERROR org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/rhn].[action] - Servlet.service() for servlet action threw exception
java.lang.RuntimeException: org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "rhn_prbst_probe_id_scout_id_pk"
    at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:461)
    at org.hibernate.jdbc.NonBatchingBatcher.addToBatch(NonBatchingBatcher.java:46)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2265)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2678)
    at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:79)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:278)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:262)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:166)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1030)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:367)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
    at com.redhat.rhn.common.hibernate.ConnectionManager.commitTransaction(ConnectionManager.java:253)
    at com.redhat.rhn.common.hibernate.HibernateFactory.commitTransaction(HibernateFactory.java:330)
    at com.redhat.rhn.frontend.servlets.SessionFilter.doFilter(SessionFilter.java:58)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at com.redhat.rhn.frontend.servlets.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:97)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
    at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:200)
    at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
    at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:775)
    at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:704)
    at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:897)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
    at java.lang.Thread.run(Thread.java:738)
Caused by: 
org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "rhn_prbst_probe_id_scout_id_pk"
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2062)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1795)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:367)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:321)
    at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:447)
    ... 33 more