add methods in the model

    @OneToMany(cascade = { CascadeType.MERGE, CascadeType.PERSIST, CascadeType.REFRESH })

    private Set<RelatedParty> relatedParties = new HashSet<>();

    public GeographicSite addCalendarPeriod(CalendarPeriod calendarPeriod){

        if(this.calendar==null){

            this.calendar=new HashSet<>();

        }

        this.calendar.add(calendarPeriod);

        return this;

    }

    public GeographicSite addPlaceRefOrValue(PlaceRefOrValue placeRefOrValue){

        if(this.placeRefOrValue==null){

            this.placeRefOrValue=new HashSet<>();

        }

        this.placeRefOrValue.add(placeRefOrValue);

        return this;

    }

    public GeographicSite addGeographicSiteRelationship(GeographicSiteRelationship geographicSiteRelationship){

        if (this.geographicSiteRelationship==null){

            this.geographicSiteRelationship=new HashSet<>();

        }

        this.geographicSiteRelationship.add(geographicSiteRelationship);

        return this;

    }

    public GeographicSite addRelatedParty(RelatedParty relatedParty){

        if(this.relatedParties==null){

            this.relatedParties=new HashSet<>();

        }

        this.relatedParties.add(relatedParty);

        return this;

    }

    @Override

    public boolean equals(Object o) {

        if (this == o) return true;