diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/LimitingResourceQueueElement.java b/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/LimitingResourceQueueElement.java
index b430be1d4..b8ff8bdbd 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/LimitingResourceQueueElement.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/planner/limiting/entities/LimitingResourceQueueElement.java
@@ -109,6 +109,13 @@ public class LimitingResourceQueueElement extends BaseEntity {
 
     public void setStartDate(LocalDate date) {
         startQueuePosition.setDate(date);
+        notifyQueueElementIsMoved();
+    }
+
+    private void notifyQueueElementIsMoved() {
+        if (getLimitingResourceQueue() != null) {
+            getLimitingResourceQueue().queueElementMoved(this);
+        }
     }
 
     public int getStartHour() {
@@ -117,6 +124,7 @@ public class LimitingResourceQueueElement extends BaseEntity {
 
     public void setStartHour(int hour) {
         startQueuePosition.setHour(hour);
+        notifyQueueElementIsMoved();
     }
 
     public LocalDate getEndDate() {
@@ -124,6 +132,7 @@ public class LimitingResourceQueueElement extends BaseEntity {
     }
 
     public void setEndDate(LocalDate date) {
+        notifyQueueElementIsMoved();
         endQueuePosition.setDate(date);
     }
 
@@ -133,6 +142,7 @@ public class LimitingResourceQueueElement extends BaseEntity {
 
     public void setEndHour(int hour) {
         endQueuePosition.setHour(hour);
+        notifyQueueElementIsMoved();
     }
 
     public Date getEarlierStartDateBecauseOfGantt() {
diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/LimitingResourceQueue.java b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/LimitingResourceQueue.java
index dbcddd6e8..4bb6d59ee 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/LimitingResourceQueue.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/resources/entities/LimitingResourceQueue.java
@@ -66,12 +66,16 @@ public class LimitingResourceQueue extends BaseEntity {
     public void addLimitingResourceQueueElement(LimitingResourceQueueElement element) {
         element.setLimitingResourceQueue(this);
         limitingResourceQueueElements.add(element);
-        cachedGaps = null;
+        invalidCachedGaps();
     }
 
     public void removeLimitingResourceQueueElement(LimitingResourceQueueElement element) {
         limitingResourceQueueElements.remove(element);
         element.detach();
+        invalidCachedGaps();
+    }
+
+    private void invalidCachedGaps() {
         cachedGaps = null;
     }
 
@@ -125,4 +129,9 @@ public class LimitingResourceQueue extends BaseEntity {
         return queueElements.subList(position + 1, queueElements.size());
     }
 
+    public void queueElementMoved(
+            LimitingResourceQueueElement limitingResourceQueueElement) {
+        invalidCachedGaps();
+    }
+
 }