>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3589028. --> Reported by: [pwolanin](https://www.drupal.org/user/49851) Related to !4 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Upgrading from 10.0 to 10.6 and trying to use an entity reference field on a node that references a config term we always get a validation error like:<br> <code> "field_hazards.0.target_id: This entity (config_terms_term: hazards_uncharacterized_unknown) cannot be referenced.",&nbsp;&nbsp; </code></p> <p>The entity reference field has this for the selection handler:</p> <pre>settings:<br>&nbsp; handler: 'default:config_terms_term'<br>&nbsp; handler_settings:<br>&nbsp;&nbsp;&nbsp; target_bundles: {&nbsp; }<br>&nbsp;&nbsp;&nbsp; auto_create: false<br>&nbsp;&nbsp;&nbsp; target_vocab: chemical_profile_hazards</pre><p>this is also generating a warning in a DSM and log messages:<br> Deprecated function: mb_strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\Core\Config\Entity\Query\Condition-&gt;compile() (line 39 of core/lib/Drupal/Core/Config/Entity/Query/Condition.php).</p> <p>This appears to come from the logic in \Drupal\Core\Entity\Plugin\EntityReferenceSelection\DefaultSelection::buildEntityQuery() that sets the ID to null if the target bundles is an empty arry:</p> <pre>&nbsp;&nbsp;&nbsp; // If 'target_bundles' is NULL, all bundles are referenceable, no further<br>&nbsp;&nbsp;&nbsp; // conditions are needed.<br>&nbsp;&nbsp;&nbsp; if (is_array($configuration['target_bundles'])) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // If 'target_bundles' is an empty array, no bundle is referenceable,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // force the query to never return anything and bail out early.<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if ($configuration['target_bundles'] === []) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; $query-&gt;condition($entity_type-&gt;getKey('id'), NULL, '=');<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return $query;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</pre><h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>override TermSelection::buildEntityQuery() to filter by vid against target_vocab</p> <p>We already do this in a way in \Drupal\config_terms\Plugin\EntityReferenceSelection\TermSelection::getReferenceableEntities()</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <p>write fix add tests</p> <h3 id="summary-ui-changes">User interface changes</h3> <p>n/a</p> <h3 id="summary-api-changes">API changes</h3> <p>n/a</p> <h3 id="summary-data-model-changes">Data model changes</h3> <p>n/a</p>