Adding Embeddable entities to JPA Entity on single View

Vaadin 6 / 7 / 8 Framework Data Binding
1

I have used the demo model
https://github.com/peholmst/ActivitiVaadinDevoxx11

I have a form the creates an Object:

@Entity(name = "SUD_REQUEST")
public class SudRequest extends AbstractEntity
        implements Serializable {
    ...
    @ElementCollection
    @CollectionTable(name = JpaConstants.RELEASE_NOTE,
            joinColumns = @JoinColumn(name = JpaConstants.SUD_ID))
    @Column(name = JpaConstants.SUD_RELEASE_NOTES, nullable = true)
    private List<ReleaseNote> releaseNotes;
    ...

Then my Release Note:

@Embeddable
public class ReleaseNote implements Serializable {

    @Column
    String creator;
    @Column
    String text;

    @Column
    @Temporal(TemporalType.TIMESTAMP)
    protected Calendar timestamp;

I want to be able to add a note to the Request with the currentLoggedInUser and current timestamp.

Can someone help me understand how to tackle this issue in a single form?
Even if I use a popup window. But I am not clear how to associate the popup formData back to the SudRequestForm…?