Index: continuum-core/src/main/java/org/apache/maven/continuum/builddefinition/DefaultBuildDefinitionService.java
===================================================================
--- continuum-core/src/main/java/org/apache/maven/continuum/builddefinition/DefaultBuildDefinitionService.java	(revision 697686)
+++ continuum-core/src/main/java/org/apache/maven/continuum/builddefinition/DefaultBuildDefinitionService.java	(working copy)
@@ -483,10 +483,17 @@
     {
         try
         {
-            BuildDefinitionTemplate stored = getBuildDefinitionTemplate( buildDefinitionTemplate.getId() );
-            stored.setName( buildDefinitionTemplate.getName() );
-            stored.setBuildDefinitions( buildDefinitionTemplate.getBuildDefinitions() );
-            return buildDefinitionTemplateDao.updateBuildDefinitionTemplate( stored );
+            if ( !hasDuplicateTemplateName( buildDefinitionTemplate ) )
+            {
+                BuildDefinitionTemplate stored = getBuildDefinitionTemplate( buildDefinitionTemplate.getId() );
+                stored.setName( buildDefinitionTemplate.getName() );
+                stored.setBuildDefinitions( buildDefinitionTemplate.getBuildDefinitions() );
+                return buildDefinitionTemplateDao.updateBuildDefinitionTemplate( stored );
+            }
+            else
+            {
+                return null;
+            }
         }
         catch ( ContinuumStoreException e )
         {
@@ -499,7 +506,14 @@
     {
         try
         {
-            return buildDefinitionTemplateDao.addBuildDefinitionTemplate( buildDefinitionTemplate );
+            if ( !hasDuplicateTemplateName( buildDefinitionTemplate ) )
+            {
+                return buildDefinitionTemplateDao.addBuildDefinitionTemplate( buildDefinitionTemplate );
+            }
+            else
+            {
+                return null;
+            }
         }
         catch ( ContinuumStoreException e )
         {
@@ -640,4 +654,22 @@
             throw new BuildDefinitionServiceException( e.getMessage(), e );
         }
     }
+    
+    private boolean hasDuplicateTemplateName( BuildDefinitionTemplate buildDefinitionTemplate )
+        throws BuildDefinitionServiceException
+    {
+        boolean isDuplicate = false;
+        List<BuildDefinitionTemplate> allBuildDefinitionTemplate = this.getAllBuildDefinitionTemplate();
+        
+        for ( BuildDefinitionTemplate template : allBuildDefinitionTemplate )
+        {
+            String name = buildDefinitionTemplate.getName();
+            if ( ( template.getId() != buildDefinitionTemplate.getId() ) && ( template.getName().equals( name ) ) )
+            {
+                isDuplicate = true;
+                break;
+            }
+        }
+        return isDuplicate;
+    }
 }