diff --git a/application/dashboardlayout.class.inc.php b/application/dashboardlayout.class.inc.php
index d9fa2362d2..813b16c4ec 100644
--- a/application/dashboardlayout.class.inc.php
+++ b/application/dashboardlayout.class.inc.php
@@ -137,7 +137,7 @@ abstract class DashboardLayoutMultiCol extends DashboardLayout
 						/** @var \Dashlet $oDashlet */
 						foreach ($aDashlets as $oDashlet) {
 							if ($oDashlet::IsVisible()) {
-								$oDashboardGrid->AddDashlet($oDashlet->DoRender($oPage, $bEditMode, true /* bEnclosingDiv */, $aExtraParams), $oDashlet->GetID(), get_class($oDashlet), $oDashlet->GetNormalizedProperties());
+								$oDashboardGrid->AddDashlet($oDashlet->DoRender($oPage, $bEditMode, true /* bEnclosingDiv */, $aExtraParams), $oDashlet->GetID(), get_class($oDashlet), $oDashlet->GetDenormalizedProperties());
 								//$oDashboardColumn->AddUIBlock($oDashlet->DoRender($oPage, $bEditMode, true /* bEnclosingDiv */, $aExtraParams));
 							}
 						}
diff --git a/application/dashlet.class.inc.php b/application/dashlet.class.inc.php
index 77ed69fae0..f414fe20b3 100644
--- a/application/dashlet.class.inc.php
+++ b/application/dashlet.class.inc.php
@@ -506,7 +506,7 @@ EOF
 		$this->sDashletType = $sDashletType;
 	}
 
-	public function GetNormalizedProperties(): ?array
+	public function GetDenormalizedProperties(): ?array
 	{
 		return XMLNormalizer::GetInstance()->Denormalize($this->aProperties, get_class($this), 'Dashlet');
 	}
diff --git a/sources/PropertyType/Serializer/XMLFormat/XMLFormatCSV.php b/sources/PropertyType/Serializer/XMLFormat/XMLFormatCSV.php
index d8382722c5..511b11efba 100644
--- a/sources/PropertyType/Serializer/XMLFormat/XMLFormatCSV.php
+++ b/sources/PropertyType/Serializer/XMLFormat/XMLFormatCSV.php
@@ -14,18 +14,22 @@ class XMLFormatCSV extends AbstractXMLFormat
 {
 	public function Normalize($value, AbstractValueType $oValueType): mixed
 	{
-		return implode(',', $value);
+		return $value;
 	}
 
 	public function EncodeToDOMNode(mixed $normalizedValue, DesignElement $oDOMNode, AbstractValueType $oValueType): void
 	{
+		if (is_array($normalizedValue)) {
+			$normalizedValue = implode(',', $normalizedValue);
+		}
 		$oTextNode = $oDOMNode->ownerDocument->createTextNode($normalizedValue);
 		$oDOMNode->appendChild($oTextNode);
 	}
 
 	public function DecodeFromDOMNode(DesignElement $oDOMNode, AbstractValueType $oValueType): mixed
 	{
-		return $oDOMNode->GetText('');
+		$value = $oDOMNode->GetText('');
+		return explode(',', $value);
 	}
 
 	public function Denormalize($normalizedValue, AbstractValueType $oValueType): mixed
diff --git a/sources/PropertyType/Serializer/XMLSerializer.php b/sources/PropertyType/Serializer/XMLSerializer.php
index 37e1e7d818..6e111982e1 100644
--- a/sources/PropertyType/Serializer/XMLSerializer.php
+++ b/sources/PropertyType/Serializer/XMLSerializer.php
@@ -36,11 +36,11 @@ class XMLSerializer
 		$this->SerializeForPropertyType($value, $oParentNode, $sPropertyTypeXML);
 	}
 
-	public function Unserialize(DesignElement $oDOMNode, string $sId, string $sType): mixed
+	public function Deserialize(DesignElement $oDOMNode, string $sId, string $sType): mixed
 	{
 		$sPropertyTypeXML = PropertyTypeCompiler::GetInstance()->GetXMLContent($sId, $sType);
 
-		return $this->UnserializeForPropertyType($oDOMNode, $sPropertyTypeXML);
+		return $this->DeserializeForPropertyType($oDOMNode, $sPropertyTypeXML);
 	}
 
 	public function SerializeForPropertyType(mixed $value, DesignElement $oParentNode, string $sPropertyTypeXML): void
@@ -50,7 +50,7 @@ class XMLSerializer
 		XMLEncoder::GetInstance()->EncodeForPropertyType($normalizedValue, $oParentNode, $sPropertyTypeXML);
 	}
 
-	public function UnserializeForPropertyType(DesignElement $oParentNode, string $sPropertyTypeXML): mixed
+	public function DeserializeForPropertyType(DesignElement $oParentNode, string $sPropertyTypeXML): mixed
 	{
 		$normalizedValue = XMLEncoder::GetInstance()->DecodeForPropertyType($oParentNode, $sPropertyTypeXML);
 
diff --git a/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLNormalizerTest.php b/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLNormalizerTest.php
new file mode 100644
index 0000000000..0c6ef30a08
--- /dev/null
+++ b/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLNormalizerTest.php
@@ -0,0 +1,170 @@
+<?php
+
+/*
+ * @copyright   Copyright (C) 2010-2026 Combodo SAS
+ * @license     http://opensource.org/licenses/AGPL-3.0
+ */
+
+use Combodo\iTop\PropertyType\Compiler\PropertyTypeCompiler;
+use Combodo\iTop\PropertyType\PropertyTypeDesign;
+use Combodo\iTop\Service\DependencyInjection\ServiceLocator;
+use Combodo\iTop\Test\UnitTest\ItopDataTestCase;
+
+class XMLNormalizerTest extends ItopDataTestCase
+{
+	/**
+	 * @dataProvider XMLNormalizerProvider
+	 *
+	 * @param $denormalizedValue
+	 * @param string $sPropertyTypeXML
+	 * @param string $normalizedValue
+	 *
+	 * @return void
+	 * @throws \DOMException
+	 */
+	public function testNormalizeXML($denormalizedValue, string $sPropertyTypeXML, $normalizedValue)
+	{
+		ServiceLocator::GetInstance()->RegisterService('ModelReflection', new ModelReflectionRuntime());
+
+		$oDOMDocument = new PropertyTypeDesign();
+		$oDOMDocument->preserveWhiteSpace = false;
+		$oDOMDocument->formatOutput = true;
+
+		/** @var \Combodo\iTop\DesignElement $oRootNode */
+		$oRootNode = $oDOMDocument->createElement('root');
+		$oDOMDocument->appendChild($oRootNode);
+
+		$actualValue = Combodo\iTop\PropertyType\Serializer\XMLNormalizer::GetInstance()->NormalizeForPropertyType($denormalizedValue, $sPropertyTypeXML);
+
+		$this->assertEquals($normalizedValue, $actualValue);
+	}
+
+	public function XMLNormalizerProvider()
+	{
+		return [
+			'Basic test should serialize to XML' => [
+				'denormalizedValue' => 'text',
+				'sPropertyTypeXML' => <<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<property_type id="basic_test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Combodo-PropertyType" xsi:noNamespaceSchemaLocation = "https://www.combodo.com/itop-schema/3.3">
+	<extends>Dashlet</extends>
+    <definition xsi:type="Combodo-ValueType-Label">
+    </definition>
+</property_type>
+XML,
+				'normalizedValue' => 'text',
+			],
+			'Collection of values as CSV' => [
+				'denormalizedValue' => ['Contact', 'Organization'],
+				'sPropertyTypeXML' => <<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<property_type id="basic_test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Combodo-PropertyType" xsi:noNamespaceSchemaLocation = "https://www.combodo.com/itop-schema/3.3">
+	<extends>Dashlet</extends>
+    <definition xsi:type="Combodo-ValueType-CollectionOfValues">
+      <xml-format xsi:type="Combodo-XMLFormat-CSV"/>
+      <value-type xsi:type="Combodo-ValueType-Class">
+      </value-type>
+    </definition>
+</property_type>
+XML,
+				'normalizedValue' => ['Contact', 'Organization'],
+			],
+			'Collection of values as id attribute' => [
+				'denormalizedValue' => ['Contact', 'Organization'],
+				'sPropertyTypeXML' => <<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<property_type id="class_test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Combodo-PropertyType" xsi:noNamespaceSchemaLocation = "https://www.combodo.com/itop-schema/3.3">
+	<extends>Dashlet</extends>
+    <definition xsi:type="Combodo-ValueType-CollectionOfValues">
+      <xml-format xsi:type="Combodo-XMLFormat-ValueAsId">
+        <tag-name>item</tag-name>
+	  </xml-format>
+      <value-type xsi:type="Combodo-ValueType-Class">
+      </value-type>
+    </definition>
+</property_type>
+XML,
+				'normalizedValue' => ['Contact', 'Organization'],
+			],
+			'Collection of tree as flat array' => [
+				'denormalizedValue' => [
+					[
+						'title_property' => 'title_a',
+						'class_property' => 'class_a',
+					],
+					[
+						'title_property' => 'title_b',
+						'class_property' => 'class_b',
+					],
+				],
+				'sPropertyTypeXML' => <<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<property_type id="collection_test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Combodo-PropertyType" xsi:noNamespaceSchemaLocation = "https://www.combodo.com/itop-schema/3.3">
+	<extends>Dashlet</extends>
+    <definition xsi:type="Combodo-ValueType-Collection">
+      <xml-format xsi:type="Combodo-XMLFormat-FlatArray">
+        <count-tag>item_count</count-tag>
+        <tag-format>item_\$rank\$_\$id\$</tag-format>
+	  </xml-format>
+	  <prototype>
+        <node id="title_property" xsi:type="Combodo-ValueType-Label">
+            <label>UI:BasicTest:Prop-Title</label>
+        </node>
+        <node id="class_property" xsi:type="Combodo-ValueType-Class">
+            <label>UI:BasicTest:Prop-Class</label>
+            <categories-csv>test</categories-csv>
+        </node>
+	  </prototype>
+    </definition>
+</property_type>
+XML,
+				'normalizedValue' => [
+					'item_count' => 2,
+					'item_0_title_property' => 'title_a',
+					'item_0_class_property' => 'class_a',
+					'item_1_title_property' => 'title_b',
+					'item_1_class_property' => 'class_b',
+				],
+			],
+			'Property tree' => [
+				'denormalizedValue' => ['title_property' => 'title', 'class_property' => 'class'],
+				'sPropertyTypeXML' => <<<XML
+<?xml version="1.0" encoding="UTF-8"?>
+<property_type id="property_tree_test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Combodo-PropertyType" xsi:noNamespaceSchemaLocation = "https://www.combodo.com/itop-schema/3.3">
+	<extends>Dashlet</extends>
+    <definition xsi:type="Combodo-ValueType-PropertyTree">
+    	<nodes>
+	        <node id="title_property" xsi:type="Combodo-ValueType-Label">
+	            <label>UI:BasicTest:Prop-Title</label>
+	        </node>
+	        <node id="class_property" xsi:type="Combodo-ValueType-Class">
+	            <label>UI:BasicTest:Prop-Class</label>
+	            <categories-csv>test</categories-csv>
+	        </node>
+	    </nodes>
+    </definition>
+</property_type>
+XML,
+				'normalizedValue' => ['title_property' => 'title', 'class_property' => 'class'],
+			],
+		];
+	}
+
+	/**
+	 * @dataProvider XMLNormalizerProvider
+	 *
+	 * @param $sInputXMLContent
+	 * @param string $sPropertyTypeXML
+	 * @param $expectedValue
+	 *
+	 * @return void
+	 */
+	public function testDenormalizeXML($denormalizedValue, string $sPropertyTypeXML, $normalizedValue)
+	{
+		ServiceLocator::GetInstance()->RegisterService('ModelReflection', new ModelReflectionRuntime());
+
+		$aActualValue = Combodo\iTop\PropertyType\Serializer\XMLNormalizer::GetInstance()->DenormalizeForPropertyType($normalizedValue, $sPropertyTypeXML);
+
+		$this->assertEquals($denormalizedValue, $aActualValue);
+	}
+}
diff --git a/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLSerializerTest.php b/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLSerializerTest.php
index 41d4c14c5d..ee2adce924 100644
--- a/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLSerializerTest.php
+++ b/tests/php-unit-tests/unitary-tests/sources/PropertyType/Serializer/XMLSerializerTest.php
@@ -191,7 +191,7 @@ XML,
 		/** @var \Combodo\iTop\DesignElement $oRoot */
 		$oRoot = $oDoc->firstChild;
 
-		$aActualValue = Combodo\iTop\PropertyType\Serializer\XMLSerializer::GetInstance()->UnserializeForPropertyType($oRoot, $sPropertyTypeXML);
+		$aActualValue = Combodo\iTop\PropertyType\Serializer\XMLSerializer::GetInstance()->DeserializeForPropertyType($oRoot, $sPropertyTypeXML);
 
 		$this->assertEquals($normalizedValue, $aActualValue);
 	}