diff --git a/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/PredefinedWorkReportTypes.java b/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/PredefinedWorkReportTypes.java
index 1aa8d5281..920ce3640 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/PredefinedWorkReportTypes.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/PredefinedWorkReportTypes.java
@@ -2,6 +2,7 @@
  * This file is part of LibrePlan
  *
  * Copyright (C) 2011 CafédeRed Solutions, S.L.
+ * Copyright (C) 2012 Igalia, S.L.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -19,12 +20,14 @@
 package org.libreplan.business.workreports.entities;
 
 /**
- * Defines the default {@link WorkReportType}.
+ * Defines the default {@link WorkReportType WorkReportTypes}.
  *
  * @author Ignacio Díaz Teijido <ignacio.diaz@cafedered.com>
+ * @author Manuel Rego Casasnovas <rego@igalia.com>
  */
 public enum PredefinedWorkReportTypes {
-    DEFAULT("Default", false, false, false);
+    DEFAULT("Default", false, false, false),
+    MONTHLY_TIMESHEETS("Monthly timesheets", false, true, false);
 
     private WorkReportType workReportType;
 
@@ -41,4 +44,9 @@ public enum PredefinedWorkReportTypes {
     public WorkReportType getWorkReportType() {
         return workReportType;
     }
+
+    public String getName() {
+        return workReportType.getName();
+    }
+
 }
diff --git a/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/WorkReportTypeBootstrap.java b/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/WorkReportTypeBootstrap.java
index 7f366ecb6..1f80ff776 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/WorkReportTypeBootstrap.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/workreports/entities/WorkReportTypeBootstrap.java
@@ -2,6 +2,7 @@
  * This file is part of LibrePlan
  *
  * Copyright (C) 2011 CafédeRed Solutions, S.L.
+ * Copyright (C) 2012 Igalia, S.L.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -18,8 +19,10 @@
  */
 package org.libreplan.business.workreports.entities;
 
+import org.hibernate.NonUniqueResultException;
 import org.libreplan.business.common.daos.IEntitySequenceDAO;
 import org.libreplan.business.common.entities.EntityNameEnum;
+import org.libreplan.business.common.exceptions.InstanceNotFoundException;
 import org.libreplan.business.workreports.daos.IWorkReportTypeDAO;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Scope;
@@ -27,11 +30,16 @@ import org.springframework.stereotype.Component;
 import org.springframework.transaction.annotation.Transactional;
 
 /**
- * Creates the default {@link WorkReportType}.
+ * Creates the default {@link WorkReportType WorkReportTypes}.<br />
+ *
+ * If there is no work report types, it creates a default work report type.<br />
+ *
+ * Even if there are already some work report types defined, it creates a work
+ * report type for monthly timesheets if it is not present in the database yet.
  *
  * @author Ignacio Díaz Teijido <ignacio.diaz@cafedered.com>
+ * @author Manuel Rego Casasnovas <rego@igalia.com>
  */
-
 @Component
 @Scope("singleton")
 public class WorkReportTypeBootstrap implements IWorkReportTypeBootstrap {
@@ -48,14 +56,33 @@ public class WorkReportTypeBootstrap implements IWorkReportTypeBootstrap {
         if (workReportTypeDAO.getWorkReportTypes().size() == 0) {
             for (PredefinedWorkReportTypes predefinedWorkReportType : PredefinedWorkReportTypes
                     .values()) {
-                WorkReportType workReportType = predefinedWorkReportType
-                        .getWorkReportType();
-                workReportType.setCodeAutogenerated(true);
-                workReportType
-                        .setCode(entitySequenceDAO
-                                .getNextEntityCodeWithoutTransaction(EntityNameEnum.WORKREPORTTYPE));
-                workReportTypeDAO.save(workReportType);
+                createAndSaveWorkReportType(predefinedWorkReportType);
             }
+        } else {
+            createMonthlyTimesheetsWorkReportTypeIfNeeded();
+        }
+    }
+
+    private void createAndSaveWorkReportType(
+            PredefinedWorkReportTypes predefinedWorkReportType) {
+        WorkReportType workReportType = predefinedWorkReportType
+                .getWorkReportType();
+        workReportType.setCodeAutogenerated(true);
+        workReportType
+                .setCode(entitySequenceDAO
+                        .getNextEntityCodeWithoutTransaction(EntityNameEnum.WORKREPORTTYPE));
+        workReportTypeDAO.save(workReportType);
+    }
+
+    private void createMonthlyTimesheetsWorkReportTypeIfNeeded() {
+        try {
+            workReportTypeDAO
+                    .findUniqueByName(PredefinedWorkReportTypes.MONTHLY_TIMESHEETS
+                            .getName());
+        } catch (NonUniqueResultException e) {
+            throw new RuntimeException(e);
+        } catch (InstanceNotFoundException e) {
+            createAndSaveWorkReportType(PredefinedWorkReportTypes.MONTHLY_TIMESHEETS);
         }
     }