diff --git a/sources/Forms/Block/IO/FormBinding.php b/sources/Forms/Block/IO/FormBinding.php
index 8664b8657..15e348881 100644
--- a/sources/Forms/Block/IO/FormBinding.php
+++ b/sources/Forms/Block/IO/FormBinding.php
@@ -11,12 +11,17 @@ namespace Combodo\iTop\Forms\Block\IO;
  */
 class FormBinding
 {
+	public readonly AbstractFormIO $oSourceIO;
+	public readonly AbstractFormIO $oDestinationIO;
+
 	/**
 	 * @param AbstractFormIO $oSourceIO
 	 * @param AbstractFormIO $oDestinationIO
 	 */
-	public function __construct(public readonly AbstractFormIO $oSourceIO, public readonly AbstractFormIO $oDestinationIO)
+	public function __construct(AbstractFormIO $oSourceIO, AbstractFormIO $oDestinationIO)
 	{
+		$this->oDestinationIO = $oDestinationIO;
+		$this->oSourceIO = $oSourceIO;
 
 	}
 
diff --git a/sources/Forms/Block/IO/Format/AttributeIOFormat.php b/sources/Forms/Block/IO/Format/AttributeIOFormat.php
index c62a342b5..2e16d42a8 100644
--- a/sources/Forms/Block/IO/Format/AttributeIOFormat.php
+++ b/sources/Forms/Block/IO/Format/AttributeIOFormat.php
@@ -6,8 +6,11 @@ use JsonSerializable;
 
 class AttributeIOFormat implements JsonSerializable
 {
-	public function __construct(public string $sAttributeName)
+	public string $sAttributeName;
+
+	public function __construct(string $sAttributeName)
 	{
+		$this->sAttributeName = $sAttributeName;
 		// validation du format sinon exception
 	}
 
diff --git a/sources/Forms/Block/IO/Format/ClassIOFormat.php b/sources/Forms/Block/IO/Format/ClassIOFormat.php
index f8d9b64bf..ceedbf5ea 100644
--- a/sources/Forms/Block/IO/Format/ClassIOFormat.php
+++ b/sources/Forms/Block/IO/Format/ClassIOFormat.php
@@ -6,8 +6,11 @@ use JsonSerializable;
 
 class ClassIOFormat implements JsonSerializable
 {
-	public function __construct(public string $sClassName)
+	public string $sClassName;
+
+	public function __construct(string $sClassName)
 	{
+		$this->sClassName = $sClassName;
 		// validation du format sinon exception
 	}
 
diff --git a/sources/Forms/Block/IO/Format/RawFormat.php b/sources/Forms/Block/IO/Format/RawFormat.php
index 04ab08f97..ec8e3895e 100644
--- a/sources/Forms/Block/IO/Format/RawFormat.php
+++ b/sources/Forms/Block/IO/Format/RawFormat.php
@@ -4,8 +4,11 @@ namespace Combodo\iTop\Forms\Block\IO\Format;
 
 class RawFormat
 {
-	public function __construct(public string $oValue)
+	public string $oValue;
+
+	public function __construct(string $oValue)
 	{
+		$this->oValue = $oValue;
 		// validation du format sinon exception
 	}
 
diff --git a/sources/Forms/FormBuilder/DependencyHandler.php b/sources/Forms/FormBuilder/DependencyHandler.php
index 3bc70b537..0b17af973 100644
--- a/sources/Forms/FormBuilder/DependencyHandler.php
+++ b/sources/Forms/FormBuilder/DependencyHandler.php
@@ -27,6 +27,11 @@ class DependencyHandler
 
 	/** @var array Debug data */
 	private array $aDebugData = [];
+	private readonly string $sName;
+	private readonly AbstractFormBlock $oFormBlock;
+	private readonly FormBuilder $oFormBuilder;
+	private readonly array $aSubBlocks;
+	private readonly array $aDependentBlocks;
 
 	/**
 	 * Constructor.
@@ -37,8 +42,13 @@ class DependencyHandler
 	 * @param array $aSubBlocks Sub blocks
 	 * @param array $aDependentBlocks Dependants blocks
 	 */
-	public function __construct(private readonly string $sName, private readonly AbstractFormBlock $oFormBlock, private readonly FormBuilder $oFormBuilder, private readonly array $aSubBlocks, private readonly array $aDependentBlocks)
+	public function __construct(string $sName, AbstractFormBlock $oFormBlock, FormBuilder $oFormBuilder, array $aSubBlocks, array $aDependentBlocks)
 	{
+		$this->aDependentBlocks = $aDependentBlocks;
+		$this->aSubBlocks = $aSubBlocks;
+		$this->oFormBuilder = $oFormBuilder;
+		$this->oFormBlock = $oFormBlock;
+		$this->sName = $sName;
 		// dependencies map
 		$this->oDependenciesMap = new DependencyMap($aDependentBlocks);
 
diff --git a/sources/Forms/FormBuilder/DependencyMap.php b/sources/Forms/FormBuilder/DependencyMap.php
index a5b9e43d5..783bc71d3 100644
--- a/sources/Forms/FormBuilder/DependencyMap.php
+++ b/sources/Forms/FormBuilder/DependencyMap.php
@@ -25,14 +25,16 @@ class DependencyMap
 
 	/** @var array output to outputs */
 	private array $aOutputToOutputsMap = [];
+	private readonly array $aDependentBlocks;
 
 	/**
 	 * Constructor.
 	 *
 	 * @param array $aDependentBlocks
 	 */
-	public function __construct(private readonly array $aDependentBlocks)
+	public function __construct(array $aDependentBlocks)
 	{
+		$this->aDependentBlocks = $aDependentBlocks;
 		// Initialization
 		$this->Init();
 	}
diff --git a/sources/Forms/FormBuilder/FormBuilder.php b/sources/Forms/FormBuilder/FormBuilder.php
index 148009e3d..c0af3050d 100644
--- a/sources/Forms/FormBuilder/FormBuilder.php
+++ b/sources/Forms/FormBuilder/FormBuilder.php
@@ -32,6 +32,7 @@ class FormBuilder implements FormBuilderInterface, \IteratorAggregate
 
 	/** @var array sub blocks */
 	private array $aSubFormBlocks = [];
+	private readonly FormBuilderInterface $builder;
 
 	/**
 	 * Constructor.
@@ -39,8 +40,9 @@ class FormBuilder implements FormBuilderInterface, \IteratorAggregate
 	 * @param FormBuilderInterface $builder
 	 *
 	 */
-	public function __construct(private readonly FormBuilderInterface $builder)
+	public function __construct(FormBuilderInterface $builder)
 	{
+		$this->builder = $builder;
 		/** Get the corresponding form block @var AbstractFormBlock $oFormBlock */
 		$oFormBlock = $this->builder->getOption('form_block');