How can I prevent A child in one-to-one getting persisted/merge

[Rajeev Chaudhary]

How can I prevent A child in one-to-one getting persisted/merge. I only want
to fetch the child information. When I am persisting FacPersonDto, I get
error, saying the relation expects a value for the id. currently it is null.
I also tried making updatabale, insertable = false in
@JoinColumn(name="PERS_ID",referencedColumnName="PERS_ID") . But it didn't
work. Do I need any other setting to be done in the class. Please help. 

public class FacPersonDto extends BaseFacPersonDto implements Serializable {
        private static final long serialVersionUID = 1L;
        @EmbeddedId
         protected FacPersonPk facPK;
        @Column(name="NOTE")
        private String note;
        
       @OneToOne(optional=false,cascade=CascadeType.REFRESH)
       @JoinColumn(name="PERS_ID",referencedColumnName="PERS_ID") 
        private PersonDto personDto;

 .....

}

Note: I am using javax.persistence_1.0.0.0_1-0.jar ,
javax.transaction_1.0.0.0_1-1.jar.
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