JPA - Error of record not found soon after insertion of same

A question regarding JPA procedures, due to an error that has happened and I can not understand.

I'm taking care of a part of the system that feeds a card order table. It looks up if the user that the request references has the card, and it inserts before inserting in the credits table. However it gives a parent-key error not found, even by inserting it in the card table.

Below what is displayed in the console:

[EL Fine]: sql: 2015-04-24 16:22:50.166--ClientSession(1319007734)--Connection(2018078818)--Thread(Thread[main,5,main])--INSERT INTO CARTAO (CD_CARTAO, |demais campos|) VALUES (?, |demais campos|)
    bind => [10905487, |demais campos|]
[EL Finest]: query: 2015-04-24 16:22:50.17--UnitOfWork(459973678)--Thread(Thread[main,5,main])--Execute query UpdateObjectQuery(br.com.virtus.sgc.model.Pedido@21144823)
[EL Fine]: sql: 2015-04-24 16:22:50.171--ClientSession(1319007734)--Connection(2018078818)--Thread(Thread[main,5,main])--UPDATE PEDIDO SET CD_FASE_ATUAL = ? WHERE (CD_PEDIDO = ?)
    bind => [6, 22557]
[EL Finest]: query: 2015-04-24 16:22:50.174--UnitOfWork(459973678)--Thread(Thread[main,5,main])--Execute query InsertObjectQuery(br.com.virtus.sgc.model.Cardcredito@6e8d1800)
[EL Fine]: sql: 2015-04-24 16:22:50.175--ClientSession(1319007734)--Connection(2018078818)--Thread(Thread[main,5,main])--INSERT INTO CARDCREDITO (ID_CARDCREDITO,  VL_CREDITO, CD_CARTAO, CD_PEDIDO) VALUES (?, ?, ?, ?)
    bind => [1721388, 356, 10905487, 22557]
[EL Fine]: sql: 2015-04-24 16:22:50.182--ClientSession(1319007734)--Thread(Thread[main,5,main])--SELECT 1 FROM DUAL
[EL Warning]: 2015-04-24 16:22:50.188--UnitOfWork(459973678)--Thread(Thread[main,5,main])--Local Exception Stack: 
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: ORA-02291: restrição de integridade (SGCMASTER.RI_CARDCREDITO) violada - chave-pai não localizada

The console displays the same card number: 10905487 . This ID is generated by an Oracle Sequence.

Of course, the code:

public void processar(){
        BigDecimal icCardcredito;
        try {
            em.getTransaction().begin();
            List<Pedido> lstAProcessar  = this.listagemPedidosAProcessar();
            TipoFasePedido proc         = new TipoFasePedidoImpl().pesquisarPorId(Long.valueOf(qryParam.pesquisarPorNmChave("CD_FASE_PEDIDO_PROCESSADO").getNmValor()));
            HistoricoPedido histPed     = new HistoricoPedido();            
            for(Pedido ped:lstAProcessar){
                ped.setCardcreditos(new ArrayList<Cardcredito>());
                icCardcredito = BigDecimal.ONE;
                List<PedidoDetalhe> infoPedido = this.listaValores(ped);
                for (PedidoDetalhe info: infoPedido){
                    Produto prod = ped.getProduto();
                    Cliente clie = ped.getCliente();
                    String  cpf  = info.getCdCpf();
                    Cartao  card = new Cartao(); 
                    card         =  this.pegaCartao(cpf, clie, prod);//Aqui ele busca o cartão
                    boolean tem  = (card instanceof Cartao);
                    if (!(tem)){
                        card = novoCartao(info);
                        em.persist(card);
                    }
                    Cardcredito itemCred = new Cardcredito();
                    itemCred.setCartao(card);
                    itemCred.setVlCredito(info.getVlCredito());
                    ped.addCardcredito(itemCred);
                    em.merge(ped);
                    icCardcredito.add(BigDecimal.ONE);
                }
                histPed = new HistoricoPedido();

                histPed.setTipoFasePedido(proc);
                histPed.setDtFasePedido(new Date());
                histPed.setNmOperador(qryUtils.nmUsuarioSistema());

                ped.setTipoFasePedido(proc);
                ped.addHistoricoPedido(histPed);

                em.merge(ped);                      
            }       
        em.getTransaction().commit();
        } catch (Exception ex) {
            em.getTransaction().rollback();
            System.out.println("---ERRO!----" + ex.getMessage());
        }

    }

My question is:

What is the explanation for this? Does it have anything to do with cascadeType between tables?

I tested with ALL and PERSIST and both gave this error.

Thanks!

[ Updating ]

I was checking the base and realized that the triggers were active (to deal with the sequences , I am using @GeneratedValue and @SequenceGenerator in the template.) Inactivated and apparently this .

But still something curious happened.

The card table has a related history table. It was fed during the process, and after it had disabled triggers , it was giving error exactly in it (of parent key not found). I took the information TIMESTAMP of the date and put DATE and went through this step normally.

What relationship exists between date fields and a PK?