diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
index d5d4dcf2f..da5816c7c 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/DefaultFundamentalProperties.java
@@ -87,9 +87,8 @@ public class DefaultFundamentalProperties implements ITaskFundamentalProperties
         return new Date(beginDate);
     }
 
-    public long setBeginDate(Date beginDate) {
+    public void setBeginDate(Date beginDate) {
         this.beginDate = beginDate.getTime();
-        return lengthMilliseconds;
     }
 
     public long getLengthMilliseconds() {
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
index dc2a2d30c..659566a66 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/ITaskFundamentalProperties.java
@@ -36,11 +36,9 @@ public interface ITaskFundamentalProperties {
     public void setName(String name);
 
     /**
-     * Sets the beginDate. As result of this, the length of the task can change.
-     * So the new value is returned
-     * @return the new length
+     * Sets the beginDate.
      */
-    public long setBeginDate(Date beginDate);
+    public void setBeginDate(Date beginDate);
 
     public Date getBeginDate();
 
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
index 78a0f937f..6e92992f4 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
@@ -174,13 +174,12 @@ public abstract class Task implements ITaskFundamentalProperties {
         Validate.notNull(dependenciesEnforcerHook);
     }
 
-    public long setBeginDate(Date newStart) {
+    public void setBeginDate(Date newStart) {
         Date previousValue = fundamentalProperties.getBeginDate();
         Date previousEnd = fundamentalProperties.getEndDate();
         fundamentalProperties.setBeginDate(newStart);
         dependenciesEnforcerHook.setStartDate(previousValue, previousEnd,
                 newStart);
-        return fundamentalProperties.getLengthMilliseconds();
     }
 
     private void reloadResourcesTextIfChange(Date newDate, Date previousDate) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/TaskElementAdapter.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/TaskElementAdapter.java
index 5035161c8..c59a3a2d3 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/TaskElementAdapter.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/TaskElementAdapter.java
@@ -188,22 +188,16 @@ public class TaskElementAdapter implements ITaskElementAdapter {
         }
 
         @Override
-        public long setBeginDate(final Date beginDate) {
-            Long runOnReadOnlyTransaction = transactionService
-                    .runOnReadOnlyTransaction(new IOnTransaction<Long>() {
+        public void setBeginDate(final Date beginDate) {
+            transactionService
+                    .runOnReadOnlyTransaction(new IOnTransaction<Void>() {
                         @Override
-                        public Long execute() {
+                        public Void execute() {
                             stepsBeforePossibleReallocation();
-                            Long result = setBeginDateInsideTransaction(beginDate);
-                            return result;
+                            taskElement.moveTo(currentScenario, beginDate);
+                            return null;
                         }
                     });
-            return runOnReadOnlyTransaction;
-        }
-
-        private Long setBeginDateInsideTransaction(final Date beginDate) {
-            taskElement.moveTo(currentScenario, beginDate);
-            return getLengthMilliseconds();
         }
 
         @Override