diff --git a/QvtoTransformationRules/transforms/ClassDiagram/Instances.qvto b/QvtoTransformationRules/transforms/ClassDiagram/Instances.qvto
index 9aff172..b8e5fe1 100644
--- a/QvtoTransformationRules/transforms/ClassDiagram/Instances.qvto
+++ b/QvtoTransformationRules/transforms/ClassDiagram/Instances.qvto
@@ -25,6 +25,11 @@ mapping UML::InstanceSpecification::instanceSpecification2OPCUAObject(inout node
 
 	var classifier := self.classifier->any(true); // should only have one classifier
 	
+	assert warning (self.classifier->size() <= 1) with log("Element specifies more than one classifier. Only the first value is used");
+	_references := object OPCUA::ListOfReferences{};
+	_references.reference += object OPCUA::Reference{referenceType := getIdOrAlias("HasTypeDefinition"); value := classifier.createNodeId()}; 
+	_references.reference += object OPCUA::Reference{referenceType := getIdOrAlias("Organizes"); value := getIdOrAlias("ObjectsFolder"); isForward := false};
+
 	// transform property slots of the Instance
 	nodeset.uAVariable += self.ownedElement->selectByType(UML::Slot)->select(slot | slot.definingFeature.oclIsTypeOf(UML::Property))->map transformPropertySlot2UAVariable(result);
 	
@@ -32,10 +37,6 @@ mapping UML::InstanceSpecification::instanceSpecification2OPCUAObject(inout node
 	log("number of slots not defined in the instance: " + classifier.ownedElement->selectByType(UML::Property)->select(p | self.slot.definingFeature->excludes(p))->size().toString());
 	nodeset.uAVariable += classifier.ownedElement->selectByType(UML::Property)->select(p | self.slot.definingFeature->excludes(p))->map transformClassifierProperty2UAVariable(result);
 
-	assert warning (self.classifier->size() <= 1) with log("Element specifies more than one classifier. Only the first value is used");
-	_references := object OPCUA::ListOfReferences{};
-	_references.reference += object OPCUA::Reference{referenceType := getIdOrAlias("HasTypeDefinition"); value := classifier.createNodeId()}; 
-	_references.reference += object OPCUA::Reference{referenceType := getIdOrAlias("Organizes"); value := getIdOrAlias("ObjectsFolder"); isForward := false};
 }
 
 mapping UML::Slot::transformPropertySlot2UAVariable(inout parent : OPCUA::UANode) : OPCUA::UAVariable {
diff --git a/Uml2OpcuaTransformationTests/InstanceWithSlots.xml b/Uml2OpcuaTransformationTests/InstanceWithSlots.xml
index 6cd2e2e..73cc6b5 100644
--- a/Uml2OpcuaTransformationTests/InstanceWithSlots.xml
+++ b/Uml2OpcuaTransformationTests/InstanceWithSlots.xml
@@ -4,38 +4,38 @@
     <Uri>InstanceWithSlots</Uri>
   </NamespaceUris>
   <Aliases>
-    <Alias Alias="ObjectsFolder">i=85</Alias>
-    <Alias Alias="Organizes">i=35</Alias>
-    <Alias Alias="String">i=12</Alias>
-    <Alias Alias="ModellingRule_Mandatory">i=78</Alias>
-    <Alias Alias="HasComponent">i=47</Alias>
-    <Alias Alias="BaseObjectType">i=58</Alias>
     <Alias Alias="HasTypeDefinition">i=40</Alias>
     <Alias Alias="BaseDataVariableType">i=63</Alias>
-    <Alias Alias="HasModellingRule">i=37</Alias>
     <Alias Alias="HasSubtype">i=45</Alias>
+    <Alias Alias="HasModellingRule">i=37</Alias>
+    <Alias Alias="String">i=12</Alias>
+    <Alias Alias="ModellingRule_Mandatory">i=78</Alias>
     <Alias Alias="Int32">i=6</Alias>
+    <Alias Alias="Organizes">i=35</Alias>
+    <Alias Alias="BaseObjectType">i=58</Alias>
+    <Alias Alias="ObjectsFolder">i=85</Alias>
+    <Alias Alias="HasComponent">i=47</Alias>
   </Aliases>
-  <UAVariable BrowseName="SN" NodeId="ns=1;i=1002" ParentNodeId="ns=1;i=1000" DataType="String">
-    <DisplayName>SN</DisplayName>
+  <UAVariable BrowseName="Manufacturer" NodeId="ns=1;i=1002" ParentNodeId="ns=1;i=1000" DataType="String">
+    <DisplayName>Manufacturer</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1000</Reference>
     </References>
     <Value>
-      <types:String>#000000</types:String>
+      <types:String>ABB</types:String>
     </Value>
   </UAVariable>
-  <UAVariable BrowseName="Manufacturer" NodeId="ns=1;i=1003" ParentNodeId="ns=1;i=1000" DataType="String">
-    <DisplayName>Manufacturer</DisplayName>
+  <UAVariable BrowseName="Axes" NodeId="ns=1;i=1003" ParentNodeId="ns=1;i=1000" DataType="Int32">
+    <DisplayName>Axes</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1000</Reference>
     </References>
     <Value>
-      <types:String>ABB</types:String>
+      <types:Int32>6</types:Int32>
     </Value>
   </UAVariable>
   <UAVariable BrowseName="Description" NodeId="ns=1;i=1001" ParentNodeId="ns=1;i=1000" DataType="String">
@@ -46,15 +46,15 @@
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1000</Reference>
     </References>
   </UAVariable>
-  <UAVariable BrowseName="Axes" NodeId="ns=1;i=1004" ParentNodeId="ns=1;i=1000" DataType="Int32">
-    <DisplayName>Axes</DisplayName>
+  <UAVariable BrowseName="SN" NodeId="ns=1;i=1004" ParentNodeId="ns=1;i=1000" DataType="String">
+    <DisplayName>SN</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1000</Reference>
     </References>
     <Value>
-      <types:Int32>6</types:Int32>
+      <types:String>#000000</types:String>
     </Value>
   </UAVariable>
   <UAObjectType BrowseName="RobotType" NodeId="ns=1;i=1000">
@@ -67,34 +67,34 @@
       <Reference ReferenceType="HasComponent">ns=1;i=1004</Reference>
     </References>
   </UAObjectType>
-  <UAVariable BrowseName="Manufacturer" NodeId="ns=1;i=1006" ParentNodeId="ns=1;i=1005" DataType="String">
-    <DisplayName>Manufacturer</DisplayName>
+  <UAVariable BrowseName="Description" NodeId="ns=1;i=1008" ParentNodeId="ns=1;i=1005" DataType="String">
+    <DisplayName>Description</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1005</Reference>
     </References>
-    <Value>
-      <types:String>ABB</types:String>
-    </Value>
   </UAVariable>
-  <UAVariable BrowseName="Description" NodeId="ns=1;i=1008" ParentNodeId="ns=1;i=1005" DataType="String">
-    <DisplayName>Description</DisplayName>
+  <UAVariable BrowseName="SN" NodeId="ns=1;i=1006" ParentNodeId="ns=1;i=1005" DataType="String">
+    <DisplayName>SN</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1005</Reference>
     </References>
+    <Value>
+      <types:String>#005001</types:String>
+    </Value>
   </UAVariable>
-  <UAVariable BrowseName="SN" NodeId="ns=1;i=1007" ParentNodeId="ns=1;i=1005" DataType="String">
-    <DisplayName>SN</DisplayName>
+  <UAVariable BrowseName="Manufacturer" NodeId="ns=1;i=1007" ParentNodeId="ns=1;i=1005" DataType="String">
+    <DisplayName>Manufacturer</DisplayName>
     <References>
       <Reference ReferenceType="HasTypeDefinition">BaseDataVariableType</Reference>
       <Reference ReferenceType="HasModellingRule">ModellingRule_Mandatory</Reference>
       <Reference IsForward="false" ReferenceType="HasComponent">ns=1;i=1005</Reference>
     </References>
     <Value>
-      <types:String>#005001</types:String>
+      <types:String>ABB</types:String>
     </Value>
   </UAVariable>
   <UAVariable BrowseName="Axes" NodeId="ns=1;i=1009" ParentNodeId="ns=1;i=1005" DataType="Int32">
@@ -113,6 +113,10 @@
     <References>
       <Reference ReferenceType="HasTypeDefinition">ns=1;i=1000</Reference>
       <Reference IsForward="false" ReferenceType="Organizes">ObjectsFolder</Reference>
+      <Reference ReferenceType="HasComponent">ns=1;i=1006</Reference>
+      <Reference ReferenceType="HasComponent">ns=1;i=1007</Reference>
+      <Reference ReferenceType="HasComponent">ns=1;i=1008</Reference>
+      <Reference ReferenceType="HasComponent">ns=1;i=1009</Reference>
     </References>
   </UAObject>
 </UANodeSet>
\ No newline at end of file