diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/advance/entities/AdvanceAssigment.java b/navalplanner-business/src/main/java/org/navalplanner/business/advance/entities/AdvanceAssigment.java
index 845728fdc..06fba150a 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/advance/entities/AdvanceAssigment.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/advance/entities/AdvanceAssigment.java
@@ -3,6 +3,7 @@ package org.navalplanner.business.advance.entities;
 import java.math.BigDecimal;
 import java.util.SortedSet;
 import java.util.TreeSet;
+
 import org.hibernate.validator.NotNull;
 import org.navalplanner.business.common.BaseEntity;
 import org.navalplanner.business.orders.entities.OrderElement;
@@ -80,10 +81,6 @@ public class AdvanceAssigment extends BaseEntity {
         return this.advanceType;
     }
 
-    public void setAdvanceMeasurements(SortedSet<AdvanceMeasurement> advanceMeasurements) {
-        this.advanceMeasurements = advanceMeasurements;
-    }
-
     public SortedSet<AdvanceMeasurement> getAdvanceMeasurements() {
         return this.advanceMeasurements;
     }
diff --git a/navalplanner-business/src/main/resources/org/navalplanner/business/advance/entities/Advance.hbm.xml b/navalplanner-business/src/main/resources/org/navalplanner/business/advance/entities/Advance.hbm.xml
index 51b5aedc9..dae5c27be 100644
--- a/navalplanner-business/src/main/resources/org/navalplanner/business/advance/entities/Advance.hbm.xml
+++ b/navalplanner-business/src/main/resources/org/navalplanner/business/advance/entities/Advance.hbm.xml
@@ -42,6 +42,7 @@
     <set name="advanceMeasurements"
          cascade="all,delete-orphan"
          inverse="true"
+         access="field"
          sort="org.navalplanner.business.advance.entities.AdvanceMeasurementComparator">
             <key column="ADVANCE_ASSIGMENT_ID" />
             <one-to-many class="org.navalplanner.business.advance.entities.AdvanceMeasurement"></one-to-many>