diff -r 971d6769ad3e maven.model/src/org/netbeans/modules/maven/model/Utilities.java
--- a/maven.model/src/org/netbeans/modules/maven/model/Utilities.java	Wed May 26 20:00:35 2010 +0400
+++ b/maven.model/src/org/netbeans/modules/maven/model/Utilities.java	Wed May 26 22:13:48 2010 +0400
@@ -261,9 +261,7 @@
      * @throws java.io.IOException if saving fails.
      */
     public static void saveChanges(AbstractDocumentModel model) throws IOException {
-        if (model.isIntransaction()) {
-            model.endTransaction();
-        }
+        model.endTransaction();
         model.sync();
         DataObject dobj = model.getModelSource().getLookup().lookup(DataObject.class);
         if (dobj == null) {
@@ -335,16 +333,14 @@
                 for (ModelOperation<POMModel> op : operations) {
                     op.performOperation(model);
                 }
-                model.endTransaction();
+                // model.endTransaction(); // the transaction is ended by saveChanges() method
                 Utilities.saveChanges(model);
             } catch (IOException ex) {
                 StatusDisplayer.getDefault().setStatusText(NbBundle.getMessage(Utilities.class, "ERR_POM", ex.getLocalizedMessage()), StatusDisplayer.IMPORTANCE_ERROR_HIGHLIGHT).clear(10000);
                 Logger.getLogger(Utilities.class.getName()).log(Level.INFO, "Canot write POM", ex);
 //                Exceptions.printStackTrace(ex);
             } finally {
-                if (model.isIntransaction()) {
-                    model.rollbackTransaction();
-                }
+                model.rollbackTransaction();
             }
         } else {
             Logger.getLogger(Utilities.class.getName()).log(Level.WARNING, "Cannot create model from current content of " + pomFileObject);
@@ -375,15 +371,13 @@
                 for (ModelOperation<ProfilesModel> op : operations) {
                     op.performOperation(model);
                 }
-                model.endTransaction();
+                // model.endTransaction(); // the transaction is ended by saveChanges() method
                 Utilities.saveChanges(model);
             } catch (IOException ex) {
                 StatusDisplayer.getDefault().setStatusText(NbBundle.getMessage(Utilities.class, "ERR_PROFILE", ex.getLocalizedMessage()), StatusDisplayer.IMPORTANCE_ERROR_HIGHLIGHT).clear(10000);
                 Logger.getLogger(Utilities.class.getName()).log(Level.INFO, "Cannot write profiles.xml", ex);
             } finally {
-                if (model.isIntransaction()) {
-                    model.rollbackTransaction();
-                }
+                model.rollbackTransaction();
             }
         } else {
             //TODO report error.. what is the error?
@@ -413,15 +407,13 @@
                 for (ModelOperation<SettingsModel> op : operations) {
                     op.performOperation(model);
                 }
-                model.endTransaction();
+                // model.endTransaction(); // the transaction is ended by saveChanges() method
                 Utilities.saveChanges(model);
             } catch (IOException ex) {
                 StatusDisplayer.getDefault().setStatusText(NbBundle.getMessage(Utilities.class, "ERR_SETTINGS", ex.getLocalizedMessage()), StatusDisplayer.IMPORTANCE_ERROR_HIGHLIGHT).clear(10000);
                 Logger.getLogger(Utilities.class.getName()).log(Level.INFO, "Cannot write settings.xml", ex);
             } finally {
-                if (model.isIntransaction()) {
-                    model.rollbackTransaction();
-                }
+                model.rollbackTransaction();
             }
         } else {
             //TODO report error.. what is the error?