在persist 另外一個OneToMany 關係的時候，Item 這個entitiy 不能成功的寫入數據庫
出現錯誤 Caused by: javax.transaction.RollbackException
at org.objectweb.jotm.TransactionImpl.commit(TransactionImpl.java:325)
at org.objectweb.jotm.Current.commit(Current.java:452)
at org.ow2.easybeans.transaction.interceptors.CMTRequiredTransactionInt