diff --git a/libreplan-business/src/main/java/org/libreplan/business/common/Util.java b/libreplan-business/src/main/java/org/libreplan/business/common/Util.java
index 769ad097a..fe8bbacfb 100644
--- a/libreplan-business/src/main/java/org/libreplan/business/common/Util.java
+++ b/libreplan-business/src/main/java/org/libreplan/business/common/Util.java
@@ -27,6 +27,16 @@ import java.util.Collection;
  */
 public class Util {
 
+    public static boolean equals(BaseEntity entity1, BaseEntity entity2) {
+        if (entity1 == null || entity2 == null) {
+            return false;
+        }
+        if (entity1.getId() == null || entity2.getId() == null) {
+            return false;
+        }
+        return entity1.getId().equals(entity2.getId());
+    }
+
     public static boolean contains(Collection<? extends BaseEntity> collection,
             BaseEntity entity) {
         for (BaseEntity each : collection) {
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/IWorkReportModel.java b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/IWorkReportModel.java
index 789507fd7..5c54666ea 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/IWorkReportModel.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/IWorkReportModel.java
@@ -245,4 +245,10 @@ public interface IWorkReportModel extends IIntegrationEntityModel {
 
     WorkReportLine getFirstWorkReportLine();
 
+    /**
+     * Checks if an {@link OrderElement} is finished or not in any
+     * {@link WorkReportLine} of this report or other report.
+     */
+    boolean isFinished(OrderElement orderElement);
+
 }
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportCRUDController.java b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportCRUDController.java
index 15ee26fe8..381161b04 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportCRUDController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportCRUDController.java
@@ -1249,6 +1249,11 @@ public class WorkReportCRUDController extends GenericForwardComposer implements
             }
         });
 
+        if (!line.isFinished()
+                && workReportModel.isFinished(line.getOrderElement())) {
+            finished.setDisabled(true);
+        }
+
         row.appendChild(finished);
     }
 
diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportModel.java b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportModel.java
index 70de3ad76..048762e67 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportModel.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/workreports/WorkReportModel.java
@@ -34,6 +34,7 @@ import java.util.Set;
 import org.apache.commons.lang.Validate;
 import org.hibernate.Hibernate;
 import org.libreplan.business.common.IntegrationEntity;
+import org.libreplan.business.common.Util;
 import org.libreplan.business.common.daos.IConfigurationDAO;
 import org.libreplan.business.common.entities.EntityNameEnum;
 import org.libreplan.business.common.exceptions.InstanceNotFoundException;
@@ -51,6 +52,7 @@ import org.libreplan.business.resources.daos.IWorkerDAO;
 import org.libreplan.business.resources.entities.Resource;
 import org.libreplan.business.resources.entities.Worker;
 import org.libreplan.business.workreports.daos.IWorkReportDAO;
+import org.libreplan.business.workreports.daos.IWorkReportLineDAO;
 import org.libreplan.business.workreports.daos.IWorkReportTypeDAO;
 import org.libreplan.business.workreports.entities.WorkReport;
 import org.libreplan.business.workreports.entities.WorkReportLabelTypeAssigment;
@@ -86,6 +88,9 @@ public class WorkReportModel extends IntegrationEntityModel implements
     @Autowired
     private IWorkReportDAO workReportDAO;
 
+    @Autowired
+    private IWorkReportLineDAO workReportLineDAO;
+
     @Autowired
     private IOrderElementDAO orderElementDAO;
 
@@ -653,4 +658,25 @@ public class WorkReportModel extends IntegrationEntityModel implements
         return workReport.getWorkReportLines().iterator().next();
     }
 
+    @Override
+    @Transactional(readOnly = true)
+    public boolean isFinished(OrderElement orderElement) {
+        for (WorkReportLine line : workReport.getWorkReportLines()) {
+            if (line.isFinished()
+                    && Util.equals(line.getOrderElement(), orderElement)) {
+                return true;
+            }
+        }
+
+        List<WorkReportLine> lines = workReportLineDAO
+                .findByOrderElementNotInWorkReportAnotherTransaction(
+                        orderElement, workReport);
+        for (WorkReportLine line : lines) {
+            if (line.isFinished()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
 }