diff --git a/src/zugferd211/Model/BinaryObject.php b/src/zugferd211/Model/BinaryObject.php
new file mode 100644
index 00000000..546bfcef
--- /dev/null
+++ b/src/zugferd211/Model/BinaryObject.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Easybill\ZUGFeRD211\Model;
+
+use JMS\Serializer\Annotation as JMS;
+
+class BinaryObject
+{
+    /**
+     * @JMS\Type("string")
+     * @JMS\XmlAttribute
+     * @JMS\SerializedName("mimeCode")
+     */
+    public string $mimeCode;
+
+    /**
+     * @JMS\Type("string")
+     * @JMS\XmlAttribute
+     * @JMS\SerializedName("filename")
+     */
+    public string $filename;
+
+    /**
+     * @JMS\Type("string")
+     * @JMS\XmlValue(cdata=false)
+     */
+    public string $value;
+}
diff --git a/src/zugferd211/Model/HeaderTradeAgreement.php b/src/zugferd211/Model/HeaderTradeAgreement.php
index 63caaedd..ef15bd1a 100644
--- a/src/zugferd211/Model/HeaderTradeAgreement.php
+++ b/src/zugferd211/Model/HeaderTradeAgreement.php
@@ -5,6 +5,7 @@
 use JMS\Serializer\Annotation\SerializedName;
 use JMS\Serializer\Annotation\Type;
 use JMS\Serializer\Annotation\XmlElement;
+use JMS\Serializer\Annotation\XmlList;
 
 class HeaderTradeAgreement
 {
@@ -35,4 +36,11 @@ class HeaderTradeAgreement
      * @SerializedName("BuyerOrderReferencedDocument")
      */
     public ?ReferencedDocument $buyerOrderReferencedDocument = null;
+
+    /**
+     * @var ReferencedDocument[]
+     * @Type("array<Easybill\ZUGFeRD211\Model\ReferencedDocument>")
+     * @XmlList(inline = true, entry = "AdditionalReferencedDocument", namespace = "urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100")
+     */
+    public array $additionalReferencedDocuments = [];
 }
diff --git a/src/zugferd211/Model/ReferencedDocument.php b/src/zugferd211/Model/ReferencedDocument.php
index 5347217d..27cbd8c0 100644
--- a/src/zugferd211/Model/ReferencedDocument.php
+++ b/src/zugferd211/Model/ReferencedDocument.php
@@ -15,10 +15,38 @@ class ReferencedDocument
      */
     public Id $issuerAssignedID;
 
-    public static function create(string $orderNumber): self
+    /**
+     * @Type("Easybill\ZUGFeRD211\Model\Id")
+     * @XmlElement(cdata = false, namespace = "urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100")
+     * @SerializedName("URIID")
+     */
+    public ?Id $uriid = null;
+
+    /**
+     * @Type("string")
+     * @XmlElement(cdata = false, namespace = "urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100")
+     * @SerializedName("TypeCode")
+     */
+    public ?string $typeCode = null;
+
+    /**
+     * @Type("string")
+     * @XmlElement(cdata = false, namespace = "urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100")
+     * @SerializedName("Name")
+     */
+    public ?string $name = null;
+
+    /**
+     * @Type("Easybill\ZUGFeRD211\Model\BinaryObject")
+     * @XmlElement(cdata = false, namespace = "urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100")
+     * @SerializedName("AttachmentBinaryObject")
+     */
+    public ?BinaryObject $attachmentBinaryObject = null;
+
+    public static function create(string $issuerAssignedID): self
     {
         $self = new self();
-        $self->issuerAssignedID = Id::create($orderNumber);
+        $self->issuerAssignedID = Id::create($issuerAssignedID);
         return $self;
     }
 }