@JoinColumn (name = "ORDER_ID", referencedColumnName = "ID")
    @ManyToOne (optional = false)
     private Pedido pedidoId;

public List <Detallepedido> searchDetail(int code) {
    List <Detallepedido> list = null;
    String query;
    try {
    query = "SELECT d FROM Detallepedido d WHERE d.pedidoId.id =? 1";
    Query query = em.createQuery (query);
    query.setParameter (1, code);
    list = query.getResultList ();
    } catch (Exception ex) {
    throw ex;
    }
    return list;
    }

Detallepedido det = new Detallepedido();
    int code = det.getPedidoId ();

public List <Detallepedido> getMaestroDetalle () {
    // masters is a list <Detallepedido>
    masters = ejbFacade.searchDetail(code);
    return masters;
    }