diff --git a/web/org.openbravo.mobile.core/source/utils/ob-utilities.js b/web/org.openbravo.mobile.core/source/utils/ob-utilities.js
--- a/web/org.openbravo.mobile.core/source/utils/ob-utilities.js
+++ b/web/org.openbravo.mobile.core/source/utils/ob-utilities.js
@@ -1,6 +1,6 @@
 /*
  ************************************************************************************
- * Copyright (C) 2012-2013 Openbravo S.L.U.
+ * Copyright (C) 2012-2014 Openbravo S.L.U.
  * Licensed under the Openbravo Commercial License version 1.0
  * You may obtain a copy of the License at http://www.openbravo.com/legal/obcl.html
  * or in the legal folder of this module distribution.
@@ -573,6 +573,12 @@
       });
     }
 
+    _.each(_.keys(clonedObject.attributes), function (key) {
+      if (_.isUndefined(object.get(key))) {
+        clonedObject.set(key, null);
+      }
+    });
+
     return clonedObject;
   };
 }());
\ No newline at end of file