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 bf53d0e7e..1a1012c46 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
@@ -94,7 +94,7 @@ public abstract class Resource extends IntegrationEntity {
     private Set<ResourcesCostCategoryAssignment> resourcesCostCategoryAssignments =
         new HashSet<ResourcesCostCategoryAssignment>();
 
-    private Boolean limitedResource;
+    private Boolean limitedResource = Boolean.FALSE;
 
     private void clearCachedData() {
         assignmentsByDayCached = null;
diff --git a/navalplanner-business/src/main/resources/org/navalplanner/business/resources/entities/Resources.hbm.xml b/navalplanner-business/src/main/resources/org/navalplanner/business/resources/entities/Resources.hbm.xml
index cf89844c6..af5dd3aba 100644
--- a/navalplanner-business/src/main/resources/org/navalplanner/business/resources/entities/Resources.hbm.xml
+++ b/navalplanner-business/src/main/resources/org/navalplanner/business/resources/entities/Resources.hbm.xml
@@ -15,7 +15,7 @@
 
     <property name="code" access="property" not-null="true" unique="true"/>
 
-    <property name="limitedResource" column="LIMITED_RESOURCE" />
+    <property name="limitedResource" column="LIMITED_RESOURCE" not-null="true"/>
 
     <set access="field" cascade="all-delete-orphan" inverse="true" name="criterionSatisfactions">
       <key column="resource" not-null="true"/>