diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
index f37626a59..653df1717 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/OrderElement.java
@@ -48,7 +48,6 @@ import org.navalplanner.business.advance.exceptions.DuplicateValueTrueReportGlob
 import org.navalplanner.business.common.IntegrationEntity;
 import org.navalplanner.business.common.Registry;
 import org.navalplanner.business.common.daos.IIntegrationEntityDAO;
-import org.navalplanner.business.common.exceptions.InstanceNotFoundException;
 import org.navalplanner.business.common.exceptions.ValidationException;
 import org.navalplanner.business.labels.entities.Label;
 import org.navalplanner.business.materials.entities.MaterialAssignment;
@@ -983,6 +982,13 @@ public abstract class OrderElement extends IntegrationEntity implements
         }
     }
 
+    @Override
+    public boolean checkConstraintUniqueCode() {
+        // the automatic checking of this constraint is avoided because it uses
+        // the wrong code property
+        return true;
+    }
+
     @AssertTrue(message = "a label can not be assigned twice in the same branch")
     public boolean checkConstraintLabelNotRepeatedInTheSameBranch() {
         return checkConstraintLabelNotRepeatedInTheSameBranch(new HashSet<Label>());