diff --git a/assets/controllers/elements/structural_entity_select_controller.js b/assets/controllers/elements/structural_entity_select_controller.js
index e775af8a..60831602 100644
--- a/assets/controllers/elements/structural_entity_select_controller.js
+++ b/assets/controllers/elements/structural_entity_select_controller.js
@@ -43,7 +43,6 @@ export default class extends Controller {
             selectOnTab: true,
             maxOptions: null,
             create: allowAdd ? this.createItem.bind(this) : false,
-            createFilter: /\D/, //Must contain a non-digit character, otherwise they would be recognized as DB ID
 
             searchField: [
                 {field: "text", weight : 2},
@@ -72,7 +71,8 @@ export default class extends Controller {
 
     createItem(input, callback) {
         callback({
-            value: input,
+            //$%$ is a special value prefix, that is used to identify items, that are not yet in the DB
+            value: '$%$' + input,
             text: input,
             not_in_db_yet: true,
         });
diff --git a/src/Form/Type/Helper/StructuralEntityChoiceHelper.php b/src/Form/Type/Helper/StructuralEntityChoiceHelper.php
index 402270ce..69763e38 100644
--- a/src/Form/Type/Helper/StructuralEntityChoiceHelper.php
+++ b/src/Form/Type/Helper/StructuralEntityChoiceHelper.php
@@ -136,9 +136,10 @@ class StructuralEntityChoiceHelper
         if ($element->getID() === null) {
             if ($element instanceof AbstractStructuralDBElement) {
                 //Must be the same as the separator in the choice_loader, otherwise this will not work!
-                return $element->getFullPath('->');
+                return '$%$' . $element->getFullPath('->');
             }
-            return $element->getName();
+            // '$%$' is the indicator prefix for a new entity
+            return '$%$' . $element->getName();
         }
 
         return $element->getID();
diff --git a/src/Form/Type/StructuralEntityType.php b/src/Form/Type/StructuralEntityType.php
index 18368289..7eafccd9 100644
--- a/src/Form/Type/StructuralEntityType.php
+++ b/src/Form/Type/StructuralEntityType.php
@@ -51,11 +51,14 @@ class StructuralEntityType extends AbstractType
     public function buildForm(FormBuilderInterface $builder, array $options): void
     {
         $builder->addEventListener(FormEvents::PRE_SUBMIT, function (PreSubmitEvent $event) {
-            //When the data contains non-digit characters, we assume that the user entered a new element.
+            //When the data starts with "$%$", we assume that the user entered a new element.
             //In that case we add the new element to our choice_loader
 
             $data = $event->getData();
-            if (null === $data || !is_string($data) || $data === "" || ctype_digit($data)) {
+            if (str_starts_with($data, '$%$')) {
+                //Extract the real name from the data
+                $data = substr($data, 3);
+            } else {
                 return;
             }