diff --git a/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/TaskPropertiesController.java b/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/TaskPropertiesController.java
index ad475fb10..ea07b713e 100644
--- a/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/TaskPropertiesController.java
+++ b/libreplan-webapp/src/main/java/org/libreplan/web/planner/taskedition/TaskPropertiesController.java
@@ -138,7 +138,8 @@ public class TaskPropertiesController extends GenericForwardComposer {
 
         disabledConstraintsAndAllocations = currentTaskElement
                 .isSubcontractedAndWasAlreadySent()
-                || currentTaskElement.isLimitingAndHasDayAssignments();
+                || currentTaskElement.isLimitingAndHasDayAssignments()
+                || currentTaskElement.isUpdatedFromTimesheets();
         if (!disabledConstraintsAndAllocations && (currentTaskElement.isTask())) {
             disabledConstraintsAndAllocations = ((Task) currentTaskElement)
                     .isManualAnyAllocation();