diff --git a/source/java/org/alfresco/opencmis/CMISConnector.java b/source/java/org/alfresco/opencmis/CMISConnector.java
index b59ced16d8..5807b74e08 100644
--- a/source/java/org/alfresco/opencmis/CMISConnector.java
+++ b/source/java/org/alfresco/opencmis/CMISConnector.java
@@ -3427,34 +3427,27 @@ public class CMISConnector implements ApplicationContextAware, ApplicationListen
         		}
         	}
         	else
-        	{
-        		if (value == null)
-        		{
-        			nodeService.removeProperty(nodeRef, propertyQName);
-        		}
-        		else
-        		{
-                	// overflow check
-                	if(propDef.getPropertyDefinition().getPropertyType() == PropertyType.INTEGER && value instanceof BigInteger) 
-                	{
-                		org.alfresco.service.cmr.dictionary.PropertyDefinition def = dictionaryService.getProperty(propertyQName);
-                		QName dataDef = def.getDataType().getName();
-                		BigInteger bigValue = (BigInteger)value;
-    
-                		if ((bigValue.compareTo(maxInt) > 0 || bigValue.compareTo(minInt) < 0 ) && dataDef.equals(DataTypeDefinition.INT))
-                		{
-                			throw new CmisConstraintException("Value is out of range for property " + propertyQName.getLocalName());
-                		}
-    
-                		if ((bigValue.compareTo(maxLong) > 0 || bigValue.compareTo(minLong) < 0 ) && dataDef.equals(DataTypeDefinition.LONG))
-                		{
-                			throw new CmisConstraintException("Value is out of range for property " + propertyQName.getLocalName());
-                		}
-                	}
-    
-                	nodeService.setProperty(nodeRef, propertyQName, value);
-        		}
-        	}
+            {
+                // overflow check
+                if (propDef.getPropertyDefinition().getPropertyType() == PropertyType.INTEGER && value instanceof BigInteger)
+                {
+                    org.alfresco.service.cmr.dictionary.PropertyDefinition def = dictionaryService.getProperty(propertyQName);
+                    QName dataDef = def.getDataType().getName();
+                    BigInteger bigValue = (BigInteger) value;
+
+                    if ((bigValue.compareTo(maxInt) > 0 || bigValue.compareTo(minInt) < 0) && dataDef.equals(DataTypeDefinition.INT))
+                    {
+                        throw new CmisConstraintException("Value is out of range for property " + propertyQName.getLocalName());
+                    }
+
+                    if ((bigValue.compareTo(maxLong) > 0 || bigValue.compareTo(minLong) < 0) && dataDef.equals(DataTypeDefinition.LONG))
+                    {
+                        throw new CmisConstraintException("Value is out of range for property " + propertyQName.getLocalName());
+                    }
+                }
+
+                nodeService.setProperty(nodeRef, propertyQName, value);
+            }
         }
     }
 
diff --git a/source/test-java/org/alfresco/opencmis/CMISTest.java b/source/test-java/org/alfresco/opencmis/CMISTest.java
index d67b5be8cf..f8b1f7af13 100644
--- a/source/test-java/org/alfresco/opencmis/CMISTest.java
+++ b/source/test-java/org/alfresco/opencmis/CMISTest.java
@@ -276,7 +276,96 @@ public class CMISTest
     	this.factory = (AlfrescoCmisServiceFactory)ctx.getBean("CMISServiceFactory");
     	this.cmisConnector = (CMISConnector) ctx.getBean("CMISConnector");
     }
-    
+
+    /**
+     * Test for MNT-9203.
+     */
+    @Test
+    public void testCeheckIn()
+    {
+        String repositoryId = null;
+        ObjectData objectData = null;
+        Holder<String> objectId = null;
+        CallContext context = new SimpleCallContext("admin", "admin", CmisVersion.CMIS_1_0);
+
+        final String folderName = "testfolder." + GUID.generate();
+        final String docName = "testdoc.txt." + GUID.generate();
+        final String customModel = "my.new.model";
+
+        final QName testCustomTypeQName = QName.createQName(customModel, "sop");
+        final QName authorisedByQname = QName.createQName(customModel, "authorisedBy");
+        AuthenticationUtil.pushAuthentication();
+        AuthenticationUtil.setFullyAuthenticatedUser(AuthenticationUtil.getAdminUserName());
+        try
+        {
+            final FileInfo fileInfo = transactionService.getRetryingTransactionHelper().doInTransaction(new RetryingTransactionCallback<FileInfo>()
+            {
+                @Override
+                public FileInfo execute() throws Throwable
+                {
+                    NodeRef companyHomeNodeRef = repositoryHelper.getCompanyHome();
+
+                    FileInfo folderInfo = fileFolderService.create(companyHomeNodeRef, folderName, ContentModel.TYPE_FOLDER);
+                    nodeService.setProperty(folderInfo.getNodeRef(), ContentModel.PROP_NAME, folderName);
+
+                    FileInfo fileInfo = fileFolderService.create(folderInfo.getNodeRef(), docName, testCustomTypeQName);
+                    Map<QName, Serializable> customProperties = new HashMap<QName, Serializable>();
+
+                    customProperties.put(authorisedByQname, "customPropertyString");
+                    customProperties.put(ContentModel.PROP_NAME, docName);
+                    nodeService.setProperties(fileInfo.getNodeRef(), customProperties);
+
+                    return fileInfo;
+                }
+            });
+
+            CmisService service = factory.getService(context);
+            try
+            {
+                List<RepositoryInfo> repositories = service.getRepositoryInfos(null);
+                assertTrue(repositories.size() > 0);
+                RepositoryInfo repo = repositories.get(0);
+                repositoryId = repo.getId();
+                objectData = service.getObjectByPath(repositoryId, "/" + folderName + "/" + docName, null, true, IncludeRelationships.NONE, null, false, true, null);
+
+                // checkout
+                objectId = new Holder<String>(objectData.getId());
+                service.checkOut(repositoryId, objectId, null, new Holder<Boolean>(true));
+            }
+            finally
+            {
+                service.close();
+            }
+
+            try
+            {
+                service = factory.getService(context);
+
+                PropertyStringImpl prop = new PropertyStringImpl();
+                prop.setId("my:" + authorisedByQname.toPrefixString());
+                prop.setValue(null);
+
+                Collection<PropertyData<?>> propsList = new ArrayList<PropertyData<?>>();
+                propsList.add(prop);
+
+                Properties properties = new PropertiesImpl(propsList);
+
+                // checkIn on pwc
+                service.checkIn(repositoryId, objectId, false, properties, null, null, null, null, null, null);
+            }
+            finally
+            {
+                service.close();
+            }
+            // check that value is null
+            assertTrue(nodeService.getProperty(fileInfo.getNodeRef(), authorisedByQname) == null);
+        }
+        finally
+        {
+            AuthenticationUtil.popAuthentication();
+        }
+    }
+
     private FileInfo createContent(final String folderName, final String docName, final boolean isRule)
     {
         final FileInfo folderInfo = transactionService.getRetryingTransactionHelper().doInTransaction(new RetryingTransactionCallback<FileInfo>()
diff --git a/source/test-resources/test-cmisinteger_modell-context.xml b/source/test-resources/test-cmisinteger_modell-context.xml
index 00a5447435..3ddd89ada2 100644
--- a/source/test-resources/test-cmisinteger_modell-context.xml
+++ b/source/test-resources/test-cmisinteger_modell-context.xml
@@ -7,6 +7,7 @@
         <property name="models">
             <list>
                 <value>opencmis/testcmisinteger_model.xml</value>
+                <value>tenant/exampleModel.xml</value>
             </list>
         </property>
     </bean>