Detach One To One entity. Or is it possible not to save the OneToOne entity?

Question

Java

There is an entity-class Examination, it contains a link to another entity - ExaminationResult.

@Entity
@Table(name = "EXAMINATIONS")
public class Examination{
/***/

@OneToOne(mappedBy = "examination", cascade = {CascadeType.PERSIST, CascadeType.REFRESH, CascadeType.MERGE, CascadeType.DETACH})
    private ExaminationResult examinationResult;

/***/
}

How can I make it so that when the entityManager.merge(examination); to update only examination, and not to change examinationResult in the database, but at the same time, during other operations (persist, remove, etc.), were operations with examinationResult performed?
More specifically, entityManager.merge(examination); is called in several methods, and only in one it is not necessary to update the examinationResult, in all the rest it is necessary.