Partial update: java.lang.IllegalArgumentException: 'value' is not a valid managed object.

Realm 3.7.1 I want to partial update my RealmObject:

public class Organization extends RealmObject {
    @PrimaryKey
    private long id;
    private Boolean isReady;
    private LocalizedString name;
    private RealmList<RealmInt> recommendations;

  public void setName(LocalizedString name) {
        this.name = name;
    }
public RealmList<RealmInt> getRecom() {
        return recommendations;
    }

    public void setRecom(RealmList<RealmInt> recom) {
        this.recommendations = recom;
    }
}

public class LocalizedString extends RealmObject {
   private RealmList<CustomString> customStringList = new RealmList<>();

   public void cascadeDelete() {
        customStringList .deleteAllFromRealm(); // The cascade part
        deleteFromRealm(); // delete this object
    }
}

public class RealmInt extends RealmObject {
    private int value;

    public RealmInt() {
    }

    public RealmInt(int val) {
        value = val;
    }
}

And method for update:
public Organization updateOrCreateOrg(final String incomingOrganizationJson) throws Exception {
        Realm realm = Realm.getDefaultInstance();
        try {
            final Organization incomingOrganization = JsonUtil.gson.fromJson(incomingOrganizationJson, Organization.class);
            realm.executeTransaction(new Realm.Transaction() {
                @Override
                public void execute(Realm realm) {
                    Log.d(TAG, "saveOrg: new Transaction: execute: Adding/Updating to Realm...");
                    Organization findOrganization = realm.where(Organization.class)
                            .equalTo(Organization.ID, organizationId)
                            .findFirst();
                    if (findOrganization != null) {
                        if (incomingOrganization.getName() != null) {
                            findOrganization.setName(incomingOrganization.getName()); // ERROR HERE!!!
                        }
                    } else {
                        realm.copyToRealmOrUpdate(incomingOrganization);
                    }
                }
            });

            SyncManager.getSession((SyncConfiguration) Realm.getDefaultConfiguration()).uploadAllLocalChanges();
                 return incomingOrganization;
        } catch (InterruptedException e) {
            return null;
        } finally {
            realm.close();
            Log.d(TAG, "saveOrg: FINALLY. Success close realm!"
                        + " Realm.globalCount = " + Realm.getGlobalInstanceCount(Realm.getDefaultConfiguration()));
        }
    }

Insert is execute success. But when I want to update I get error:

updateOrCreateOrg: new Transaction: execute: Adding/Updating to Realm...

updateOrCreateOrg: FINALLY. Success close realm! Realm.globalCount = 1

Error = 'value' is not a valid managed object.
java.lang.IllegalArgumentException: 'value' is not a valid managed object.
	at io.realm.OrganizationRealmProxy.realmSet$name(OrganizationRealmProxy.java:244)
	at com.myproject..model.Organization.setName(Organization.java:56)
	at com.myproject..service.OrganizationService$1.execute(OrganizationService.java:102)
	at io.realm.Realm.executeTransaction(Realm.java:1349)
	at com.myproject..service.OrganizationService.saveOrg(OrganizationService.java:63)
	at com.myproject..server.AndroidWebServer.serve(AndroidWebServer.java:82)
	at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:840)
	at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:189)
	at java.lang.Thread.run(Thread.java:841)

Error in this line:

findOrganization.setName(incomingOrganization.getName())

[Zhuinden]

findOrganization.setName(realm.copyToRealm(incomingOrganization.getName())); 

[Zhuinden]

Ya. For a managed object, an object you want to set as a linked object must also be a managed RealmObject as well, for example the return value of realm.copyToRealm(blah) or so.