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 8fe1bc22f..0d24d77d7 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/data/Task.java
@@ -118,10 +118,11 @@ public abstract class Task implements ITaskFundamentalProperties {
         return fundamentalProperties.getLengthMilliseconds();
     }
 
-    public void fireChangesForOldValues(Date oldBegin, long oldLength) {
+    public void fireChangesForPreviousValues(Date previousStart,
+            long previousLength) {
         fundamentalPropertiesListeners.firePropertyChange("beginDate",
-                oldBegin, fundamentalProperties.getBeginDate());
-        fireLengthMilliseconds(oldLength);
+                previousStart, fundamentalProperties.getBeginDate());
+        fireLengthMilliseconds(previousLength);
     }
 
     public Date getBeginDate() {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/ResourceAllocationModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/ResourceAllocationModel.java
index 0b5ba8dd6..31781f800 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/ResourceAllocationModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/ResourceAllocationModel.java
@@ -128,10 +128,11 @@ public class ResourceAllocationModel implements IResourceAllocationModel {
     }
 
     private void doTheAllocation(AllocationResult allocationResult) {
-        Date oldBeginDate = ganttTask.getBeginDate();
-        long oldLength = ganttTask.getLengthMilliseconds();
+        Date previousStartDate = ganttTask.getBeginDate();
+        long previousLength = ganttTask.getLengthMilliseconds();
         allocationResult.applyTo(task);
-        ganttTask.fireChangesForOldValues(oldBeginDate, oldLength);
+        ganttTask.fireChangesForPreviousValues(previousStartDate,
+                previousLength);
     }
 
     private List<Resource> getResourcesMatchingCriterions() {