diff --git a/sources/Forms/Block/AbstractFormBlock.php b/sources/Forms/Block/AbstractFormBlock.php
index 67e926fe8..14455a1a8 100644
--- a/sources/Forms/Block/AbstractFormBlock.php
+++ b/sources/Forms/Block/AbstractFormBlock.php
@@ -7,13 +7,14 @@
 namespace Combodo\iTop\Forms\Block;
 
 use Combodo\iTop\Forms\Block\Base\FormBlock;
+use Combodo\iTop\Forms\IFormBlock;
 use Combodo\iTop\Forms\IO\AbstractFormIO;
+use Combodo\iTop\Forms\IO\Converter\AbstractConverter;
 use Combodo\iTop\Forms\IO\Format\RawFormat;
 use Combodo\iTop\Forms\IO\FormInput;
 use Combodo\iTop\Forms\IO\FormOutput;
 use Combodo\iTop\Forms\Register\IORegister;
 use Combodo\iTop\Forms\Register\OptionsRegister;
-use Combodo\iTop\Forms\IFormBlock;
 
 /**
  * Abstract form block.
@@ -187,21 +188,6 @@ abstract class AbstractFormBlock implements IFormBlock
 	 */
 	public function AddInput(string $sName, string $sType): AbstractFormBlock
 	{
-		// Check name validity
-		if (preg_match('/(?<name>\w+)/', $sName, $aMatches)) {
-			$sParsedName = $aMatches['name'];
-			if ($sParsedName !== $sName) {
-				$sName = json_encode($sName);
-				$sParsedName = json_encode($sParsedName);
-				$sBlockName = json_encode($this->getName());
-				Throw new FormBlockException("Input $sName does not match $sParsedName for block $sBlockName.");
-			}
-		} else {
-			$sName = json_encode($sName);
-			$sBlockName = json_encode($this->getName());
-			Throw new FormBlockException("Input $sName is not valid for block $sBlockName.");
-		}
-		// Name is valid
 		$this->oIORegister->AddInput($sName, $sType);
 		return $this;
 	}
diff --git a/sources/Forms/Block/Base/CollectionBlock.php b/sources/Forms/Block/Base/CollectionBlock.php
index f4be6e6fe..c45079e27 100644
--- a/sources/Forms/Block/Base/CollectionBlock.php
+++ b/sources/Forms/Block/Base/CollectionBlock.php
@@ -72,10 +72,6 @@ class CollectionBlock extends AbstractTypeFormBlock
 		$sBlockEntryOptions = $this->GetOption('block_entry_options');
 		$this->oPrototypeBlock = new ($sBlockEntryType)('prototype', $sBlockEntryOptions);
 
-		//		$this->HandleBlockDependencies();
-//		$this->oBlock->SetParent($this->GetParent());
-//		$oBlock->DependsOn('company', 'company', AbstractFormBlock::OUTPUT_VALUE);
-
 		$oOptionsRegister->SetOption('entry_type', $this->oPrototypeBlock->GetFormType());
 		$oOptionsRegister->SetOption('entry_options', $this->oPrototypeBlock->GetOptions());
 	}
diff --git a/sources/Forms/Block/Base/FormBlock.php b/sources/Forms/Block/Base/FormBlock.php
index 4e0936239..3a8e6eda4 100644
--- a/sources/Forms/Block/Base/FormBlock.php
+++ b/sources/Forms/Block/Base/FormBlock.php
@@ -9,10 +9,10 @@ namespace Combodo\iTop\Forms\Block\Base;
 use Combodo\iTop\Forms\Block\AbstractFormBlock;
 use Combodo\iTop\Forms\Block\AbstractTypeFormBlock;
 use Combodo\iTop\Forms\Block\FormBlockException;
-use Combodo\iTop\Forms\FormType\Base\FormType;
-use Combodo\iTop\Forms\Register\OptionsRegister;
 use Combodo\iTop\Forms\FormBuilder\DependencyMap;
 use Combodo\iTop\Forms\FormsException;
+use Combodo\iTop\Forms\FormType\Base\FormType;
+use Combodo\iTop\Forms\Register\OptionsRegister;
 use Exception;
 use ReflectionClass;
 use ReflectionException;
@@ -43,8 +43,8 @@ class FormBlock extends AbstractTypeFormBlock
 			// Build the form
 			$this->BuildForm();
 		}
-		catch (Exception $ex) {
-			throw new FormsException('Unable to construct demonstrator form.', 0, $ex);
+		catch (Exception $e) {
+			throw new FormBlockException('Unable to construct form', 0, $e);
 		}
 	}
 
@@ -72,6 +72,7 @@ class FormBlock extends AbstractTypeFormBlock
 	 *
 	 * @return $this
 	 * @throws ReflectionException
+	 * @throws \Combodo\iTop\Forms\Block\FormBlockException
 	 */
 	public function Add(string $sName, string $sType, array $aSymfonyOptions, array $aOptions = []): AbstractFormBlock
 	{
diff --git a/sources/Forms/Block/DataModel/AttributeValueChoiceFormBlock.php b/sources/Forms/Block/DataModel/AttributeValueChoiceFormBlock.php
index 0d5ce92a2..0d3eb157f 100644
--- a/sources/Forms/Block/DataModel/AttributeValueChoiceFormBlock.php
+++ b/sources/Forms/Block/DataModel/AttributeValueChoiceFormBlock.php
@@ -7,6 +7,7 @@
 namespace Combodo\iTop\Forms\Block\DataModel;
 
 use Combodo\iTop\Forms\Block\Base\ChoiceFormBlock;
+use Combodo\iTop\Forms\Block\FormBlockException;
 use Combodo\iTop\Forms\IO\Format\AttributeIOFormat;
 use Combodo\iTop\Forms\IO\Format\ClassIOFormat;
 use Combodo\iTop\Forms\IO\Format\RawFormat;
@@ -47,7 +48,9 @@ class AttributeValueChoiceFormBlock extends ChoiceFormBlock
 		$oIORegister->AddOutput(self::OUTPUT_VALUE, RawFormat::class);
 	}
 
-	/** @inheritdoc  */
+	/** @inheritdoc
+	 * @throws \Combodo\iTop\Forms\Block\FormBlockException
+	 */
 	public function UpdateOptions(OptionsRegister $oOptionsRegister): void
 	{
 		parent::UpdateOptions($oOptionsRegister);
@@ -55,13 +58,15 @@ class AttributeValueChoiceFormBlock extends ChoiceFormBlock
 		$oClassName = $this->GetInputValue(self::INPUT_CLASS_NAME);
 		$oAttribute = $this->GetInputValue(self::INPUT_ATTRIBUTE);
 
-		try{
+		try {
 			$oAttDef = MetaModel::GetAttributeDef(strval($oClassName), strval($oAttribute));
 			$aValues = $oAttDef->GetAllowedValues();
 
 			$oOptionsRegister->SetOption('choices', array_flip($aValues ?? []));
 		}
-		catch(Exception){}
+		catch (Exception $e) {
+			throw new FormBlockException('Update option failed for '.json_encode($this->GetName()), 0, $e);
+		}
 	}
 
 }
\ No newline at end of file
diff --git a/sources/Forms/FormBuilder/DependencyHandler.php b/sources/Forms/FormBuilder/DependencyHandler.php
index 18143b7b1..1aeb86a3c 100644
--- a/sources/Forms/FormBuilder/DependencyHandler.php
+++ b/sources/Forms/FormBuilder/DependencyHandler.php
@@ -137,10 +137,10 @@ class DependencyHandler
 			$oFormBlock = $this->oFormBlock->Get($oForm->getName());
 
 			// Compute the block outputs with the data
-			try{
+			try {
 				$oFormBlock->ComputeOutputs($sEventType, $oForm->getData());
 			}
-			catch(Exception $e){
+			catch (Exception $e) {
 				$oForm->addError(new FormError($e->getMessage()));
 			}
 
@@ -150,19 +150,19 @@ class DependencyHandler
 
 	}
 
-
 	/**
 	 * @param FormInterface|FormBuilderInterface $oForm
 	 * @param string|null $sOutputBlock
 	 * @param string|null $sEventType
 	 *
 	 * @return void
+	 * @throws \Combodo\iTop\Forms\Block\FormBlockException
 	 */
 	private function CheckDependencies(FormInterface|FormBuilderInterface $oForm, string $sOutputBlock = null, string $sEventType = null): void
 	{
 		$aImpactedBlocks = $this->aDependentBlocks;
-		if($sOutputBlock !== null){
-			$aImpactedBlocks = $this->oDependenciesMap->GetBlocksImpactedBy($sOutputBlock, function(AbstractFormBlock $oBlock) use ($sEventType) {
+		if ($sOutputBlock !== null) {
+			$aImpactedBlocks = $this->oDependenciesMap->GetBlocksImpactedBy($sOutputBlock, function (AbstractFormBlock $oBlock) use ($sEventType) {
 				return $oBlock instanceof AbstractTypeFormBlock;
 			});
 		}
@@ -213,9 +213,7 @@ class DependencyHandler
 				// Add event
 				$this->AddEvent('form.remove', $oDependentBlock->getName());
 			}
-
 		}
-
 	}
 
 	/**
diff --git a/sources/Forms/FormBuilder/FormTypeExtension.php b/sources/Forms/FormBuilder/FormTypeExtension.php
index 51d9a9dd2..e40e92ea3 100644
--- a/sources/Forms/FormBuilder/FormTypeExtension.php
+++ b/sources/Forms/FormBuilder/FormTypeExtension.php
@@ -46,7 +46,6 @@ class FormTypeExtension extends AbstractTypeExtension
 			$builder->addEventListener(FormEvents::POST_SET_DATA, $options['builder_listener']);
 			$builder->addEventListener(FormEvents::POST_SUBMIT, $options['builder_listener']);
 		}
-
 	}
 
 	/** @inheritdoc */
@@ -58,7 +57,5 @@ class FormTypeExtension extends AbstractTypeExtension
 			$oFormBlock = $options['form_block'];
 			$view->vars['trigger_form_submit_on_modify'] = $oFormBlock->ImpactDependentsBlocks();
 		}
-
 	}
-
 }
\ No newline at end of file
diff --git a/sources/Forms/IO/AbstractFormIO.php b/sources/Forms/IO/AbstractFormIO.php
index 6ef401cd2..c9823ccf8 100644
--- a/sources/Forms/IO/AbstractFormIO.php
+++ b/sources/Forms/IO/AbstractFormIO.php
@@ -40,7 +40,7 @@ class AbstractFormIO
 	 */
 	public function __construct(string $sName, string $sType, AbstractFormBlock $oOwnerBlock)
 	{
-		$this->sName = $sName;
+		$this->SetName($sName);
 		$this->sType = $sType;
 		$this->oOwnerBlock = $oOwnerBlock;
 	}
@@ -71,9 +71,26 @@ class AbstractFormIO
 	 * @param string $sName
 	 *
 	 * @return self
+	 * @throws \Combodo\iTop\Forms\IO\FormBlockIOException
 	 */
 	public function SetName(string $sName): self
 	{
+		// Check name validity
+		if (preg_match('/(?<name>\w+)/', $sName, $aMatches)) {
+			$sParsedName = $aMatches['name'];
+			if ($sParsedName !== $sName) {
+				$sName = json_encode($sName);
+				$sParsedName = json_encode($sParsedName);
+				$sBlockName = json_encode($this->getName());
+				Throw new FormBlockIOException("Input $sName does not match $sParsedName for block $sBlockName.");
+			}
+		} else {
+			$sName = json_encode($sName);
+			$sBlockName = json_encode($this->getName());
+			Throw new FormBlockIOException("Input $sName is not valid for block $sBlockName.");
+		}
+
+		// Name is valid
 		$this->sName = $sName;
 
 		return $this;
@@ -210,7 +227,7 @@ class AbstractFormIO
 	 *
 	 * @return void
 	 */
-	public function Attach(FormBinding $oFormBinding)
+	public function Attach(FormBinding $oFormBinding): void
 	{
 		$this->oBinding = $oFormBinding;
 	}
diff --git a/sources/Forms/IO/Converter/OqlToClassConverter.php b/sources/Forms/IO/Converter/OqlToClassConverter.php
index 3a31986c5..4e50d01f3 100644
--- a/sources/Forms/IO/Converter/OqlToClassConverter.php
+++ b/sources/Forms/IO/Converter/OqlToClassConverter.php
@@ -7,15 +7,17 @@
 namespace Combodo\iTop\Forms\IO\Converter;
 
 use Combodo\iTop\Forms\IO\Format\ClassIOFormat;
+use Combodo\iTop\Forms\IO\FormBlockIOException;
 use MetaModel;
-use Symfony\Component\Filesystem\Exception\IOException;
 
 /**
  * OQL expression to class converter.
  */
 class OqlToClassConverter extends AbstractConverter
 {
-	/** @inheritdoc */
+	/** @inheritdoc
+	 * @throws \Combodo\iTop\Forms\IO\FormBlockIOException
+	 */
 	public function Convert(mixed $oData): ?ClassIOFormat
 	{
 		if ($oData === null) {
@@ -29,12 +31,12 @@ class OqlToClassConverter extends AbstractConverter
 		if (isset($aMatches[1])) {
 			$sSelectedClass = $aMatches[1];
 			if (!MetaModel::IsValidClass($sSelectedClass)) {
-				throw new IOException("Class `$sSelectedClass` not found");
+				throw new FormBlockIOException('Class '.json_encode($sSelectedClass).' not found');
 			}
 
 			return new ClassIOFormat($aMatches[1]);
 		} else {
-			throw new IOException('Incorrect OQL sentence');
+			throw new FormBlockIOException('Incorrect OQL sentence '.json_encode($oData));
 		}
 
 
diff --git a/sources/Forms/Register/IORegister.php b/sources/Forms/Register/IORegister.php
index e308681eb..10dd5cd54 100644
--- a/sources/Forms/Register/IORegister.php
+++ b/sources/Forms/Register/IORegister.php
@@ -43,7 +43,7 @@ class IORegister
 	 * @param string $sOutputBlockName
 	 * @param string $sOutputName
 	 *
-	 * @return AbstractFormBlock
+	 * @return $this
 	 * @throws FormBlockException
 	 */
 	public function AddInputDependsOn(string $sName, string $sOutputBlockName, string $sOutputName): self
@@ -171,7 +171,7 @@ class IORegister
 	public function GetOutput(string $sName): FormOutput
 	{
 		if (!array_key_exists($sName, $this->aOutputs)) {
-			throw new FormBlockException('Missing output '.$sName.' for '.$this->oFormBlock->GetName());
+			throw new FormBlockException('Missing output '.json_encode($sName).' for '.json_encode($this->oFormBlock->GetName()));
 		}
 
 		return $this->aOutputs[$sName];