diff --git a/src/CXml/Model/ItemDetail.php b/src/CXml/Model/ItemDetail.php
index 71eb5fb..fa41d84 100644
--- a/src/CXml/Model/ItemDetail.php
+++ b/src/CXml/Model/ItemDetail.php
@@ -48,7 +48,7 @@ protected function __construct(
         private readonly MoneyWrapper $unitPrice,
         #[Serializer\SerializedName('PriceBasisQuantity')]
         #[Serializer\XmlElement(cdata: false)]
-        private readonly ?PriceBasisQuantity $priceBasisQuantity,
+        private readonly ?PriceBasisQuantity $priceBasisQuantity = null,
     ) {
     }
 
diff --git a/src/CXml/Model/Message/PunchOutOrderMessageHeader.php b/src/CXml/Model/Message/PunchOutOrderMessageHeader.php
index 2ca28f8..eeeaa8c 100644
--- a/src/CXml/Model/Message/PunchOutOrderMessageHeader.php
+++ b/src/CXml/Model/Message/PunchOutOrderMessageHeader.php
@@ -23,7 +23,7 @@ class PunchOutOrderMessageHeader
     final public const OPERATION_INSPECT = 'inspect';
 
     #[Serializer\XmlAttribute]
-    private readonly ?string $operationAllowed;
+    private ?string $operationAllowed = null; /* cant be 'readonly' bc must be initialized with null -> jms deserialization */
 
     #[Serializer\SerializedName('ShipTo')]
     private ?ShipTo $shipTo = null;
diff --git a/src/CXml/Model/MultilanguageString.php b/src/CXml/Model/MultilanguageString.php
index 6d41bb4..e4462d8 100644
--- a/src/CXml/Model/MultilanguageString.php
+++ b/src/CXml/Model/MultilanguageString.php
@@ -10,7 +10,7 @@ class MultilanguageString
 {
     public function __construct(
         #[Serializer\XmlValue(cdata: false)]
-        private readonly ?string $value,
+        private readonly ?string $value = null,
         #[Serializer\XmlAttribute]
         private readonly ?string $type = null,
         #[Serializer\XmlAttribute(namespace: 'http://www.w3.org/XML/1998/namespace')]
diff --git a/src/CXml/Model/Request/OrderRequestHeader.php b/src/CXml/Model/Request/OrderRequestHeader.php
index f601963..2ac534f 100644
--- a/src/CXml/Model/Request/OrderRequestHeader.php
+++ b/src/CXml/Model/Request/OrderRequestHeader.php
@@ -43,6 +43,10 @@ class OrderRequestHeader
     #[Serializer\Type('array<CXml\Model\BusinessPartner>')]
     private array $businessPartners;
 
+    #[Serializer\XmlElement]
+    #[Serializer\SerializedName('ShipTo')]
+    private ?ShipTo $shipTo = null; /* cant be 'readonly' bc must be initialized with null -> jms deserialization */
+
     protected function __construct(
         #[Serializer\XmlAttribute]
         #[Serializer\SerializedName('orderID')]
@@ -50,9 +54,7 @@ protected function __construct(
         #[Serializer\XmlAttribute]
         #[Serializer\SerializedName('orderDate')]
         private readonly DateTimeInterface $orderDate,
-        #[Serializer\XmlElement]
-        #[Serializer\SerializedName('ShipTo')]
-        private readonly ?ShipTo $shipTo,
+        ?ShipTo $shipTo, /* cant be 'readonly' bc must be initialized with null -> jms deserialization */
         #[Serializer\XmlElement]
         #[Serializer\SerializedName('BillTo')]
         private readonly BillTo $billTo,
@@ -67,15 +69,11 @@ protected function __construct(
         #[Serializer\XmlList(entry: 'Contact', inline: true)]
         private ?array $contacts = null,
     ) {
-        if (null === $contacts) {
-            return;
-        }
+        $this->shipTo = $shipTo;
 
-        if ([] === $contacts) {
-            return;
+        if (null !== $contacts) {
+            Assertion::allIsInstanceOf($contacts, Contact::class);
         }
-
-        Assertion::allIsInstanceOf($contacts, Contact::class);
     }
 
     public static function create(
diff --git a/tests/CXmlTest/Model/SerializerTest.php b/tests/CXmlTest/Model/SerializerTest.php
index 786f534..8dcc3ee 100644
--- a/tests/CXmlTest/Model/SerializerTest.php
+++ b/tests/CXmlTest/Model/SerializerTest.php
@@ -410,4 +410,54 @@ public function testDeserializeOneRowXml(): void
 
         $this->assertXmlStringEqualsXmlString($xml, $resultingXml);
     }
+
+    public function testDeserializeNullProperty(): void
+    {
+        $xml =
+            '<?xml version="1.0" encoding="UTF-8"?>
+			<cXML payloadID="payload-id" timestamp="2000-01-01T00:00:00+00:00">
+			<Header>
+			<From>
+			<Credential domain="AribaNetworkUserId">
+			<Identity>admin@acme.com</Identity>
+			</Credential>
+			</From>
+			<To>
+			<Credential domain="DUNS">
+			<Identity>012345678</Identity>
+			</Credential>
+			</To>
+			<Sender>
+			<Credential domain="AribaNetworkUserId">
+			<Identity>sysadmin@buyer.com</Identity>
+			<SharedSecret>abracadabra</SharedSecret>
+			</Credential>
+			<UserAgent>Network Hub 1.1</UserAgent>
+			</Sender>
+			</Header>
+			<Request>
+				<OrderRequest>
+				  <OrderRequestHeader orderDate="2000-01-01" orderID="order-id" type="new">
+					<Total>
+					  <Money currency="EUR">0.00</Money>
+					</Total>
+					<BillTo>
+					  <Address>
+						<Name xml:lang="en">name</Name>
+					  </Address>
+					</BillTo>
+				  </OrderRequestHeader>
+				</OrderRequest>
+			</Request>
+			</cXML>';
+
+        $cxml = Serializer::create()->deserialize($xml);
+
+        /** @var OrderRequest $orderRequest */
+        $orderRequest = $cxml->getRequest()->getPayload();
+
+        // Error: Typed property CXml\Model\Request\OrderRequestHeader::$shipTo must not be accessed before initialization
+        $shipTo = $orderRequest->getOrderRequestHeader()->getShipTo();
+        $this->assertNull($shipTo);
+    }
 }