diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/orders/OrderCRUDController.java b/libreplan-webapp/src/main/java/org/libreplan/web/orders/OrderCRUDController.java
index 000382f69..cf1331fda 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/orders/OrderCRUDController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/orders/OrderCRUDController.java
@@ -36,8 +36,13 @@ import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.LogFactory;
 import org.hibernate.validator.InvalidValue;
 import org.libreplan.business.calendars.entities.BaseCalendar;
+import org.libreplan.business.common.Registry;
+import org.libreplan.business.common.exceptions.InstanceNotFoundException;
 import org.libreplan.business.common.exceptions.ValidationException;
 import org.libreplan.business.externalcompanies.entities.ExternalCompany;
+import org.libreplan.business.materials.daos.IMaterialCategoryDAO;
+import org.libreplan.business.materials.entities.MaterialCategory;
+import org.libreplan.business.orders.daos.IOrderDAO;
 import org.libreplan.business.orders.entities.HoursGroup;
 import org.libreplan.business.orders.entities.Order;
 import org.libreplan.business.orders.entities.Order.SchedulingMode;
@@ -217,6 +222,9 @@ public class OrderCRUDController extends GenericForwardComposer {
 
     private ProjectDetailsController projectDetailsController;
 
+    @Autowired
+    private IOrderDAO orderDAO;
+
     @Override
     public void doAfterCompose(Component comp) throws Exception {
         super.doAfterCompose(comp);
@@ -1473,4 +1481,30 @@ public class OrderCRUDController extends GenericForwardComposer {
         }
     }
 
+    public void chekValidProjectName(Textbox textbox) {
+        try {
+            Order found = orderDAO.findByNameAnotherTransaction(textbox
+                    .getValue());
+            if ((found != null) && (!found.getId().equals(getOrder().getId()))) {
+                throw new WrongValueException(textbox,
+                        _("project name already being used"));
+            }
+        } catch (InstanceNotFoundException e) {
+            return;
+        }
+    }
+
+    public void chekValidProjectCode(Textbox textbox) {
+        try {
+            Order found = orderDAO.findByCodeAnotherTransaction(textbox
+                    .getValue());
+            if ((found != null) && (!found.getId().equals(getOrder().getId()))) {
+                throw new WrongValueException(textbox,
+                        _("code already being used"));
+            }
+        } catch (InstanceNotFoundException e) {
+            return;
+        }
+    }
+
 }
diff --git a/libreplan-webapp/src/main/webapp/orders/_edition.zul b/libreplan-webapp/src/main/webapp/orders/_edition.zul
index 8519608da..c8c2dabc3 100644
--- a/libreplan-webapp/src/main/webapp/orders/_edition.zul
+++ b/libreplan-webapp/src/main/webapp/orders/_edition.zul
@@ -70,13 +70,17 @@
                     <rows>
                         <row>
                             <label value="${i18n:_('Name')}" />
-                            <textbox value="@{controller.order.name}" width="500px"/>
+                            <textbox value="@{controller.order.name}" width="500px"
+                                constraint="no empty:${i18n:_('cannot be null or empty')}"
+                                onBlur="controller.chekValidProjectName(self)"/>
                         </row>
                         <row>
                             <label value="${i18n:_('Code')}" />
                             <hbox>
                                 <textbox value="@{controller.order.code}" width="250px"
-                                    disabled="@{controller.codeAutogenerated}" />
+                                    disabled="@{controller.codeAutogenerated}"
+                                    constraint="no empty:${i18n:_('cannot be null or empty')}"
+                                    onBlur="controller.chekValidProjectCode(self)" />
                                 <checkbox label="${i18n:_('Generate code')}"
                                     checked="@{controller.codeAutogenerated}" />
                             </hbox>