diff --git a/copasi/xml/CCopasiXMLInterface.cpp b/copasi/xml/CCopasiXMLInterface.cpp
index cb55955a92..62458b65d5 100644
--- a/copasi/xml/CCopasiXMLInterface.cpp
+++ b/copasi/xml/CCopasiXMLInterface.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2019 - 2020 by Pedro Mendes, Rector and Visitors of the
+// Copyright (C) 2019 - 2024 by Pedro Mendes, Rector and Visitors of the
 // University of Virginia, University of Heidelberg, and University
 // of Connecticut School of Medicine.
 // All rights reserved.
@@ -463,7 +463,7 @@ bool CCopasiXMLInterface::saveParameter(const CCopasiParameter & parameter)
         break;
 
       case CCopasiParameter::Type::CN:
-        Attributes.add("value", parameter.getValue< CCommonName >());
+        Attributes.add("value", parameter.getValue< CRegisteredCommonName >());
 
         if (!saveElement("Parameter", Attributes)) success = false;
 
diff --git a/copasi/xml/parser/ParameterHandler.cpp b/copasi/xml/parser/ParameterHandler.cpp
index cb1b6b6343..141c5009f0 100644
--- a/copasi/xml/parser/ParameterHandler.cpp
+++ b/copasi/xml/parser/ParameterHandler.cpp
@@ -1,4 +1,4 @@
-// Copyright (C) 2019 - 2020 by Pedro Mendes, Rector and Visitors of the
+// Copyright (C) 2019 - 2024 by Pedro Mendes, Rector and Visitors of the
 // University of Virginia, University of Heidelberg, and University
 // of Connecticut School of Medicine.
 // All rights reserved.
@@ -18,6 +18,8 @@
 #include "ParameterHandler.h"
 
 #include "CXMLParser.h"
+#include "copasi/CopasiDataModel/CDataModel.h"
+#include "copasi/core/CRegisteredCommonName.h"
 #include "copasi/utilities/CCopasiParameter.h"
 
 /**
@@ -47,7 +49,6 @@ CXMLHandler * ParameterHandler::processStart(const XML_Char * pszName,
   std::string sValue("");
   bool UnmappedKey = false;
 
-  void * pValue = NULL;
   CCopasiParameter::Type type;
 
   C_FLOAT64 d;
@@ -69,26 +70,28 @@ CXMLHandler * ParameterHandler::processStart(const XML_Char * pszName,
             sValue = cValue;
           }
 
+        mpData->pCurrentParameter = new CCopasiParameter(name, type);
+
         switch (type)
           {
             case CCopasiParameter::Type::DOUBLE:
               d = CCopasiXMLInterface::DBL(sValue.c_str());
-              pValue = &d;
+              mpData->pCurrentParameter->setValue(d);
               break;
 
             case CCopasiParameter::Type::UDOUBLE:
               d = CCopasiXMLInterface::DBL(sValue.c_str());
-              pValue = &d;
+              mpData->pCurrentParameter->setValue(d);
               break;
 
             case CCopasiParameter::Type::INT:
               i = strToInt(sValue.c_str());
-              pValue = &i;
+              mpData->pCurrentParameter->setValue(i);
               break;
 
             case CCopasiParameter::Type::UINT:
               ui = strToUnsignedInt(sValue.c_str());
-              pValue = &ui;
+              mpData->pCurrentParameter->setValue(ui);
               break;
 
             case CCopasiParameter::Type::BOOL:
@@ -102,19 +105,17 @@ CXMLHandler * ParameterHandler::processStart(const XML_Char * pszName,
                   b = true;
                 }
 
-              pValue = &b;
+              mpData->pCurrentParameter->setValue(b);
               break;
 
             case CCopasiParameter::Type::STRING:
             case CCopasiParameter::Type::FILE:
-            case CCopasiParameter::Type::CN:
-              pValue = &sValue;
+              mpData->pCurrentParameter->setValue(sValue);
               break;
 
             case CCopasiParameter::Type::KEY:
             {
-              if (sValue != "" &&
-                  CKeyFactory::isValidKey(sValue))
+              if (sValue != "" && CKeyFactory::isValidKey(sValue))
                 {
                   CDataObject * pObject = mpData->mKeyMap.get(sValue);
 
@@ -128,20 +129,21 @@ CXMLHandler * ParameterHandler::processStart(const XML_Char * pszName,
                     }
                 }
 
-              pValue = &sValue;
+              mpData->pCurrentParameter->setValue(sValue);
             }
             break;
 
+            case CCopasiParameter::Type::CN:
+              mpData->pCurrentParameter->setValue(CRegisteredCommonName(sValue, mpData->pDataModel));
+              break;
+
             default:
               if (cType != NULL) // otherwise missing attribute will have been logged
                 CCopasiMessage(CCopasiMessage::ERROR, MCXML + 16, name.c_str(), cType, mpParser->getCurrentLineNumber());
 
-              pValue = NULL;
               break;
           }
 
-        mpData->pCurrentParameter = new CCopasiParameter(name, type, pValue);
-
         if (UnmappedKey)
           {
             mpData->UnmappedKeyParameters.push_back(mpData->pCurrentParameter->getKey());
diff --git a/copasi/xml/parser/TaskHandler.cpp b/copasi/xml/parser/TaskHandler.cpp
index 5588ce206d..a6551b0162 100644
--- a/copasi/xml/parser/TaskHandler.cpp
+++ b/copasi/xml/parser/TaskHandler.cpp
@@ -26,6 +26,7 @@
 #include "copasi/utilities/CTaskFactory.h"
 #include "copasi/model/CModel.h"
 #include "copasi/function/CExpression.h"
+#include "copasi/CopasiDataModel/CDataModel.h"
 
 /**
  * Replace Task with the name type of the handler and implement the
@@ -241,7 +242,7 @@ bool TaskHandler::processEnd(const XML_Char * pszName)
                       continue;
 
                     pGroup->addParameter("Role", CCopasiParameter::Type::UINT, entry.second.first);
-                    pGroup->addParameter("Object CN", CCopasiParameter::Type::CN, CRegisteredCommonName(entry.second.second, pGroup));
+                    pGroup->addParameter("Object CN", CCopasiParameter::Type::CN, CRegisteredCommonName(entry.second.second, mpData->pDataModel));
                   }
               }
           }