diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Resource.java b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Resource.java
index 51fb106c6..36a621729 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Resource.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/Resource.java
@@ -106,6 +106,8 @@ public abstract class Resource extends BaseEntity{
         }
         return list;
     }
+
+    @Valid
     public Set<CriterionSatisfaction> getCriterionSatisfactions() {
         Set<CriterionSatisfaction> satisfactionActives =
                 new HashSet<CriterionSatisfaction>();
diff --git a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/resources/api/ResourceServiceTest.java b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/resources/api/ResourceServiceTest.java
index d948732c1..a202f79af 100644
--- a/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/resources/api/ResourceServiceTest.java
+++ b/navalplanner-webapp/src/test/java/org/navalplanner/web/test/ws/resources/api/ResourceServiceTest.java
@@ -162,6 +162,39 @@ public class ResourceServiceTest {
 
     }
 
+    @Test
+    @NotTransactional
+    public void testAddResourceWithCriterionSatisfactionsWithoutStartDate() {
+
+        /* Create a criterion type. */
+        CriterionType ct = createCriterionType();
+
+        /* Create a resource DTO. */
+        MachineDTO machineDTO = new MachineDTO(ct.getName(), "name", "desc");
+        machineDTO.criterionSatisfactions.add(
+            new CriterionSatisfactionDTO(ct.getName() , "c1",
+                null, Calendar.getInstance().getTime())); // Missing start date.
+
+        /* Test. */
+        List<ResourceDTO> resources = new ArrayList<ResourceDTO>();
+        resources.add(machineDTO);
+
+        List<InstanceConstraintViolationsDTO> instanceConstraintViolationsList =
+            resourceService.addResources(new ResourceListDTO(resources)).
+                instanceConstraintViolationsList;
+
+        assertTrue(instanceConstraintViolationsList.size() == 1);
+        assertTrue(instanceConstraintViolationsList.get(0).
+            constraintViolations.size() == 1);
+
+        try {
+            findUniqueMachineByCode(machineDTO.code);
+            fail("InstanceNotFoundException expected");
+        } catch (InstanceNotFoundException e) {
+        }
+
+    }
+
     @Test
     @NotTransactional
     public void testAddResourceWithCriterionSatisfactionsWithIncorrectNames() {
diff --git a/scripts/rest-clients/resources-sample.xml b/scripts/rest-clients/resources-sample.xml
index 65cd373c0..bbe88b163 100644
--- a/scripts/rest-clients/resources-sample.xml
+++ b/scripts/rest-clients/resources-sample.xml
@@ -27,4 +27,14 @@
     <!--  Missing first name, surname, and nif. -->
     <worker first-name="" nif=""/>
 
+    <!--  Missing start date in criterion satisfaction. -->
+    <worker first-name="w2-firstName" surname="w2-surname" nif=" w2-nif ">
+        <criterion-satisfaction-list>
+            <criterion-satisfaction
+                criterion-type-name="LEAVE"
+                criterion-name="paternityLeave"
+                finish-date="2009-12-25"/>
+        </criterion-satisfaction-list>
+    </worker>
+
 </resource-list>