diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
index f98ebdba5..5a1dc16b3 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/resources/criterion/CriterionsModel.java
@@ -77,6 +77,7 @@ public class CriterionsModel implements ICriterionsModel {
     }
 
     @Override
+    @Transactional(readOnly = true)
     public void workOn(Criterion criterion) {
         Validate.notNull(criterion);
         this.criterion = criterion;