>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #2897121. --> Reported by: [larowlan](https://www.drupal.org/user/395439) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>If you add a 'parent' field but then reference yourself or a descendant, it causes major issues.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Prevent referencing self or descendant</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <p>Review</p> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>