diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/FormBinder.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/FormBinder.java
index 06d5c382d..062d2cf2a 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/FormBinder.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/FormBinder.java
@@ -539,10 +539,18 @@ public class FormBinder {
                 allHoursInputChange);
         allResourcesPerDay.addEventListener(Events.ON_CHANGE,
                 allResourcesPerDayChange);
-        sumResourcesPerDayFromRowsAndAssignToAllResourcesPerDay();
+        sumResourcesPerDayOrSetToZero();
         Util.reloadBindings(allocationsGrid);
     }
 
+    private void sumResourcesPerDayOrSetToZero() {
+        if (allResourcesPerDay.isDisabled()) {
+            sumResourcesPerDayFromRowsAndAssignToAllResourcesPerDay();
+        } else {
+            allResourcesPerDay.setValue(BigDecimal.ZERO);
+        }
+    }
+
     private void distributeHoursFromTotalToRows() {
         Integer value = allHoursInput.getValue();
         value = value != null ? value : 0;