Save Cascade com EmbeddedId

Programação
,
#1

Buenas,

@Entity
@Table(name = "device_models")
public class DeviceModel extends TrackedEntity {

    private static final long serialVersionUID = -4632619367837084959L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @JsonView({Views.Entity.class})
    @Column(name = "id")
    private Long id;

    @Column(name = "name")
    @NotNull(message = "deviceModel.name.required")
    @JsonView({
            Views.Entity.class,
            AuthorizationViews.Entity.class,
            DeviceKeyViews.Entity.class,
            PromontKeyCryptView.Encrypt.class
    })
    private String name;

    @Column(name = "version")
    @JsonView({
            Views.Entity.class,
            AuthorizationViews.Entity.class,
            DeviceKeyViews.Entity.class,
            PromontKeyCryptView.Encrypt.class})
    private String version;

    @Column(name = "description")
    @JsonView({Views.Entity.class, DeviceKeyViews.Entity.class})
    private String description;

    @Enumerated(EnumType.ORDINAL)
    @JsonView({Views.Entity.class, DeviceKeyViews.Entity.class})
    private StatusEnum status;

    @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "device_model_id")
    @OrderBy("number")
    @JsonView({Views.EntityWithRelations.class})
    private Set<DevicePort> devicePorts;

     .....get, set....

}

Classe filha:

@Entity
@Table(name = "device_ports")
public class DevicePort extends TrackedEntity {

    @EmbeddedId
    @JsonUnwrapped
    private DevicePortID devicePortID;

    @MapsId("deviceModelId")
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "device_model_id", referencedColumnName = "id")
    @JsonView({DeviceKeyViews.EntityWithRelations.class})
    private DeviceModel deviceModel;

    @Enumerated(EnumType.STRING)
    @JsonView({Views.Entity.class})
    @NotNull(message = "devicePort.signal.required")
    @Column(name = "signal")
    private SignalEnum signal;

    @JsonView({Views.Entity.class})
    private StatusEnum status;
    
    ....get, set...
}

PK:

@Embeddable
public class DevicePortID implements Serializable {

    @Column(name = "device_model_id")
    private Long deviceModelId;

    @Column(name = "number")
    private Integer number;

    ....get, set....
}

O problema consiste que estou tentando salvar um DeviceModel com suas DevicePorts. Assim quem determina e é dono do relacionamento é DeviceModel.
Só que ai esta a questão, não consigo salvar a DevicePort através de um save(DeviceModel).

ocorre este erro

org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property

Alguma ideia? De como posso fazer…