diff --git a/js/forms/forms.js b/js/forms/forms.js
index 7e36cd763..e2f1820fe 100644
--- a/js/forms/forms.js
+++ b/js/forms/forms.js
@@ -14,6 +14,8 @@ function triggerTurbo(el) {
 		el.form.querySelector(`[name="${sFormName}[_turbo_trigger]"]`).value = el.getAttribute('name');
 		el.form.setAttribute('novalidate', true);
 		el.form.requestSubmit();
+		el.form.querySelector(`[name="${sFormName}[_turbo_trigger]"]`).value = null;
+		el.form.setAttribute('novalidate', false);
 		$aFormBlockDataTransmittedData[name] = el.value;
 	}
 
diff --git a/lib/composer/autoload_classmap.php b/lib/composer/autoload_classmap.php
index c52174e45..c3a3e74a4 100644
--- a/lib/composer/autoload_classmap.php
+++ b/lib/composer/autoload_classmap.php
@@ -534,6 +534,8 @@ return array(
     'Combodo\\iTop\\Forms\\Register\\OptionsRegister' => $baseDir . '/sources/Forms/Register/OptionsRegister.php',
     'Combodo\\iTop\\Forms\\Register\\RegisterException' => $baseDir . '/sources/Forms/Register/RegisterException.php',
     'Combodo\\iTop\\Forms\\Twig\\Extension\\FormCompatibilityExtension' => $baseDir . '/sources/Forms/Twig/Extension/FormCompatibilityExtension.php',
+    'Combodo\\iTop\\Forms\\Validator\\AttributeExist' => $baseDir . '/sources/Forms/Validator/AttributeExist.php',
+    'Combodo\\iTop\\Forms\\Validator\\AttributeExistValidator' => $baseDir . '/sources/Forms/Validator/AttributeExistValidator.php',
     'Combodo\\iTop\\PhpParser\\Evaluation\\PhpExpressionEvaluator' => $baseDir . '/sources/PhpParser/Evaluation/PhpExpressionEvaluator.php',
     'Combodo\\iTop\\Renderer\\BlockRenderer' => $baseDir . '/sources/Renderer/BlockRenderer.php',
     'Combodo\\iTop\\Renderer\\Bootstrap\\BsFieldRendererMappings' => $baseDir . '/sources/Renderer/Bootstrap/BsFieldRendererMappings.php',
@@ -3343,7 +3345,6 @@ return array(
     'Symfony\\Component\\Validator\\Mapping\\PropertyMetadataInterface' => $vendorDir . '/symfony/validator/Mapping/PropertyMetadataInterface.php',
     'Symfony\\Component\\Validator\\Mapping\\TraversalStrategy' => $vendorDir . '/symfony/validator/Mapping/TraversalStrategy.php',
     'Symfony\\Component\\Validator\\ObjectInitializerInterface' => $vendorDir . '/symfony/validator/ObjectInitializerInterface.php',
-    'Symfony\\Component\\Validator\\Test\\ConstraintValidatorTestCase' => $vendorDir . '/symfony/validator/Test/ConstraintValidatorTestCase.php',
     'Symfony\\Component\\Validator\\Util\\PropertyPath' => $vendorDir . '/symfony/validator/Util/PropertyPath.php',
     'Symfony\\Component\\Validator\\Validation' => $vendorDir . '/symfony/validator/Validation.php',
     'Symfony\\Component\\Validator\\ValidatorBuilder' => $vendorDir . '/symfony/validator/ValidatorBuilder.php',
@@ -3893,5 +3894,5 @@ return array(
     'privUITransactionFile' => $baseDir . '/application/transaction.class.inc.php',
     'privUITransactionSession' => $baseDir . '/application/transaction.class.inc.php',
     'utils' => $baseDir . '/application/utils.inc.php',
-    '©' => $vendorDir . '/symfony/cache/Traits/ValueWrapper.php',
+    '�' => $vendorDir . '/symfony/cache/Traits/ValueWrapper.php',
 );
diff --git a/lib/composer/autoload_static.php b/lib/composer/autoload_static.php
index b2d02aab0..1c266fd0c 100644
--- a/lib/composer/autoload_static.php
+++ b/lib/composer/autoload_static.php
@@ -920,6 +920,8 @@ class ComposerStaticInit7f81b4a2a468a061c306af5e447a9a9f
         'Combodo\\iTop\\Forms\\Register\\OptionsRegister' => __DIR__ . '/../..' . '/sources/Forms/Register/OptionsRegister.php',
         'Combodo\\iTop\\Forms\\Register\\RegisterException' => __DIR__ . '/../..' . '/sources/Forms/Register/RegisterException.php',
         'Combodo\\iTop\\Forms\\Twig\\Extension\\FormCompatibilityExtension' => __DIR__ . '/../..' . '/sources/Forms/Twig/Extension/FormCompatibilityExtension.php',
+        'Combodo\\iTop\\Forms\\Validator\\AttributeExist' => __DIR__ . '/../..' . '/sources/Forms/Validator/AttributeExist.php',
+        'Combodo\\iTop\\Forms\\Validator\\AttributeExistValidator' => __DIR__ . '/../..' . '/sources/Forms/Validator/AttributeExistValidator.php',
         'Combodo\\iTop\\PhpParser\\Evaluation\\PhpExpressionEvaluator' => __DIR__ . '/../..' . '/sources/PhpParser/Evaluation/PhpExpressionEvaluator.php',
         'Combodo\\iTop\\Renderer\\BlockRenderer' => __DIR__ . '/../..' . '/sources/Renderer/BlockRenderer.php',
         'Combodo\\iTop\\Renderer\\Bootstrap\\BsFieldRendererMappings' => __DIR__ . '/../..' . '/sources/Renderer/Bootstrap/BsFieldRendererMappings.php',
@@ -3729,7 +3731,6 @@ class ComposerStaticInit7f81b4a2a468a061c306af5e447a9a9f
         'Symfony\\Component\\Validator\\Mapping\\PropertyMetadataInterface' => __DIR__ . '/..' . '/symfony/validator/Mapping/PropertyMetadataInterface.php',
         'Symfony\\Component\\Validator\\Mapping\\TraversalStrategy' => __DIR__ . '/..' . '/symfony/validator/Mapping/TraversalStrategy.php',
         'Symfony\\Component\\Validator\\ObjectInitializerInterface' => __DIR__ . '/..' . '/symfony/validator/ObjectInitializerInterface.php',
-        'Symfony\\Component\\Validator\\Test\\ConstraintValidatorTestCase' => __DIR__ . '/..' . '/symfony/validator/Test/ConstraintValidatorTestCase.php',
         'Symfony\\Component\\Validator\\Util\\PropertyPath' => __DIR__ . '/..' . '/symfony/validator/Util/PropertyPath.php',
         'Symfony\\Component\\Validator\\Validation' => __DIR__ . '/..' . '/symfony/validator/Validation.php',
         'Symfony\\Component\\Validator\\ValidatorBuilder' => __DIR__ . '/..' . '/symfony/validator/ValidatorBuilder.php',
@@ -4279,7 +4280,7 @@ class ComposerStaticInit7f81b4a2a468a061c306af5e447a9a9f
         'privUITransactionFile' => __DIR__ . '/../..' . '/application/transaction.class.inc.php',
         'privUITransactionSession' => __DIR__ . '/../..' . '/application/transaction.class.inc.php',
         'utils' => __DIR__ . '/../..' . '/application/utils.inc.php',
-        '©' => __DIR__ . '/..' . '/symfony/cache/Traits/ValueWrapper.php',
+        '�' => __DIR__ . '/..' . '/symfony/cache/Traits/ValueWrapper.php',
     );
 
     public static function getInitializer(ClassLoader $loader)
diff --git a/sources/Forms/FormBuilder/FormBuilder.php b/sources/Forms/FormBuilder/FormBuilder.php
index e3596a951..97d9f2034 100644
--- a/sources/Forms/FormBuilder/FormBuilder.php
+++ b/sources/Forms/FormBuilder/FormBuilder.php
@@ -95,9 +95,12 @@ class FormBuilder implements FormBuilderInterface, IteratorAggregate
 			$oFormBlock->oDependencyMap = $this->oDependencyHandler->GetMap();
 		}
 
-		if (is_null($oFormBlock->GetParent())) {
+		if ($oFormBlock->IsRootBlock()) {
 			// Insert a hidden type to save the place
-			$this->builder->add('_turbo_trigger', HiddenType::class, ['prevent_form_build' => true]);
+			$this->builder->add('_turbo_trigger', HiddenType::class, [
+				'prevent_form_build' => true,
+				'mapped'             => false,
+			]);
 		}
 	}
 
diff --git a/sources/Forms/Forms.php b/sources/Forms/Forms.php
index decc1ac34..1719c452d 100644
--- a/sources/Forms/Forms.php
+++ b/sources/Forms/Forms.php
@@ -38,7 +38,9 @@ final class Forms
 	public static function createFormFactoryBuilder(): FormFactoryBuilderInterface
 	{
 		// Set up the Validator component
-		$validator = Validation::createValidator();
+		$validator = Validation::createValidatorBuilder()
+			->enableAttributeMapping()->getValidator();
+
 		return (new FormFactoryBuilder())
 			->addExtension(new HttpFoundationExtension())
 			->addExtension(new ValidatorExtension($validator))
diff --git a/sources/Forms/IO/Converter/OqlToClassConverter.php b/sources/Forms/IO/Converter/OqlToClassConverter.php
index cb1a90f7a..d5520c7cb 100644
--- a/sources/Forms/IO/Converter/OqlToClassConverter.php
+++ b/sources/Forms/IO/Converter/OqlToClassConverter.php
@@ -36,8 +36,6 @@ class OqlToClassConverter extends AbstractConverter
 		$oModelReflection = DIService::GetInstance()->GetService('ModelReflection');
 		try {
 			$oQuery = $oModelReflection->GetQuery($oData);
-		} catch (\OQLParserException $e) {
-			throw new FormBlockIOException($e->GetIssue(), $e->getCode(), $e);
 		} catch (Exception $e) {
 			throw new FormBlockIOException($e->getMessage(), $e->getCode(), $e);
 		}
diff --git a/sources/Forms/Validator/AttributeExist.php b/sources/Forms/Validator/AttributeExist.php
new file mode 100644
index 000000000..001f94baf
--- /dev/null
+++ b/sources/Forms/Validator/AttributeExist.php
@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * @copyright   Copyright (C) 2010-2025 Combodo SAS
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+
+namespace Combodo\iTop\Forms\Validator;
+
+use Attribute;
+use InvalidArgumentException;
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Attribute exist constraint.
+ *
+ * @package Combodo\iTop\Forms\Validator
+ * @since 3.3.0
+ */
+#[Attribute]
+class AttributeExist extends Constraint
+{
+	/** @var string Violation message */
+	public string $sMessage = 'The attribute "{{ attribute }}" doesn\'t exist in class "{{ class }}" from OQL "{{ oql }}".';
+
+	/** @var string|mixed OQL expression property path */
+	public string $sOqlPropertyPath;
+
+	/** @var string|null Attribute list filter */
+	public ?string $sFilter;
+
+	/**
+	 * Constructor.
+	 *
+	 * @param string|null $sOqlPropertyPath
+	 * @param string|null $sFilter
+	 * @param array $aOptions
+	 * @param array|null $aGroups
+	 * @param mixed|null $oPayload
+	 */
+	public function __construct(string $sOqlPropertyPath = null, string $sFilter = null, array $aOptions = [], ?array $aGroups = null, mixed $oPayload = null)
+	{
+		if ($sOqlPropertyPath === null) {
+			throw new InvalidArgumentException('The argument "sOqlPropertyPath" must be set.');
+		}
+
+		// Merge argument into options array
+		$aOptions = array_merge([
+			'sOqlPropertyPath' => $sOqlPropertyPath,
+		], $aOptions);
+
+		parent::__construct($aOptions, $aGroups, $oPayload);
+
+		// Retrieve options
+		$this->sFilter = $sFilter;
+		$this->sOqlPropertyPath = $aOptions['sOqlPropertyPath'];
+	}
+
+	public function getDefaultOption(): string
+	{
+		return 'sOqlPropertyPath';
+	}
+
+	public function getRequiredOptions(): array
+	{
+		return ['sOqlPropertyPath'];
+	}
+}
diff --git a/sources/Forms/Validator/AttributeExistValidator.php b/sources/Forms/Validator/AttributeExistValidator.php
new file mode 100644
index 000000000..ab364b6f2
--- /dev/null
+++ b/sources/Forms/Validator/AttributeExistValidator.php
@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * @copyright   Copyright (C) 2010-2025 Combodo SAS
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+
+namespace Combodo\iTop\Forms\Validator;
+
+use Combodo\iTop\Forms\IO\Converter\OqlToClassConverter;
+use Combodo\iTop\Service\DependencyInjection\DIService;
+use Symfony\Component\PropertyAccess\PropertyAccess;
+use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Attribute exist validator.
+ *
+ * @package Combodo\iTop\Forms\Validator
+ * @since 3.3.0
+ */
+class AttributeExistValidator extends ConstraintValidator
+{
+	private ?PropertyAccessorInterface $propertyAccessor;
+
+	public function __construct()
+	{
+		$this->propertyAccessor = PropertyAccess::createPropertyAccessor();
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function validate(mixed $value, Constraint $constraint): void
+	{
+		$sOql = $this->propertyAccessor->getValue($this->context->getObject(), $constraint->sOqlPropertyPath);
+
+		$oOqlToClassConverter = new OqlToClassConverter();
+		$sClass = strval($oOqlToClassConverter->Convert($sOql));
+
+		$sClass = "UserRequest";
+
+		/** List attributes @var ModelReflection $oModelReflection */
+		$oModelReflection = DIService::GetInstance()->GetService('ModelReflection');
+		$aAttributeCodes = array_keys($oModelReflection->ListAttributes($sClass));
+
+		if (!in_array($value, $aAttributeCodes, true)) {
+			$this->context->buildViolation($constraint->sMessage)
+				->setParameter('{{ attribute }}', $value)
+				->setParameter('{{ class }}', $sClass)
+				->setParameter('{{ oql }}', $sOql)
+				->addViolation();
+		}
+
+	}
+}