diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarEditionController.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarEditionController.java
index 1b4bebd50..960e0866b 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarEditionController.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarEditionController.java
@@ -934,6 +934,7 @@ public abstract class BaseCalendarEditionController extends
             appendStandardEffortListcell(item, calendarException.getCapacity());
             appendExtraEffortListcell(item, calendarException.getCapacity());
             appendCodeListcell(item, calendarException);
+            appendOriginListcell(item, calendarException);
             appendOperationsListcell(item, calendarException);
 
             markAsSelected(item, calendarException);
@@ -1017,6 +1018,17 @@ public abstract class BaseCalendarEditionController extends
             item.appendChild(listcell);
         }
 
+        private void appendOriginListcell(Listitem item,
+                CalendarException calendarException) {
+            Listcell listcell = new Listcell();
+            String origin = _("Inherited");
+            if (baseCalendarModel.isOwnException(calendarException)) {
+                origin = _("Direct");
+            }
+            listcell.appendChild(new Label(origin));
+            item.appendChild(listcell);
+        }
+
         private void appendOperationsListcell(Listitem item, CalendarException calendarException) {
             Listcell listcell = new Listcell();
             listcell.appendChild(createRemoveButton(calendarException));
@@ -1036,6 +1048,11 @@ public abstract class BaseCalendarEditionController extends
                             reloadDayInformation();
                         }
                     });
+            if (!baseCalendarModel.isOwnException(calendarException)) {
+                result.setDisabled(true);
+                result
+                        .setTooltiptext(_("derived exception can not be removed"));
+            }
             return result;
         }
 
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
index 38af82b7b..54cffdb15 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/BaseCalendarModel.java
@@ -34,14 +34,14 @@ import org.joda.time.LocalDate;
 import org.navalplanner.business.calendars.daos.IBaseCalendarDAO;
 import org.navalplanner.business.calendars.daos.ICalendarExceptionTypeDAO;
 import org.navalplanner.business.calendars.entities.BaseCalendar;
-import org.navalplanner.business.calendars.entities.BaseCalendar.DayType;
 import org.navalplanner.business.calendars.entities.CalendarAvailability;
 import org.navalplanner.business.calendars.entities.CalendarData;
-import org.navalplanner.business.calendars.entities.CalendarData.Days;
 import org.navalplanner.business.calendars.entities.CalendarException;
 import org.navalplanner.business.calendars.entities.CalendarExceptionType;
 import org.navalplanner.business.calendars.entities.Capacity;
 import org.navalplanner.business.calendars.entities.ResourceCalendar;
+import org.navalplanner.business.calendars.entities.BaseCalendar.DayType;
+import org.navalplanner.business.calendars.entities.CalendarData.Days;
 import org.navalplanner.business.common.IntegrationEntity;
 import org.navalplanner.business.common.daos.IConfigurationDAO;
 import org.navalplanner.business.common.entities.Configuration;
@@ -564,6 +564,11 @@ public class BaseCalendarModel extends IntegrationEntityModel implements
         return getBaseCalendar().getExceptions();
     }
 
+    @Override
+    public boolean isOwnException(CalendarException exception) {
+        return getBaseCalendar().getOwnExceptions().contains(exception);
+    }
+
     @Override
     public void removeException(LocalDate date) {
         if (getBaseCalendar() != null) {
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/IBaseCalendarModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/IBaseCalendarModel.java
index 284d77b48..32521b0b6 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/IBaseCalendarModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/calendars/IBaseCalendarModel.java
@@ -205,4 +205,6 @@ public interface IBaseCalendarModel extends IIntegrationEntityModel {
     void generateCalendarCodes();
 
     boolean isLastActivationPeriod(CalendarAvailability calendarAvailability);
+
+    boolean isOwnException(CalendarException exception);
 }
diff --git a/navalplanner-webapp/src/main/webapp/calendars/_edition.zul b/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
index d7c8ebf8c..91616d878 100644
--- a/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
+++ b/navalplanner-webapp/src/main/webapp/calendars/_edition.zul
@@ -149,6 +149,7 @@
                             <listheader label="${i18n:_('Standard Effort')}" />
                             <listheader label="${i18n:_('Extra Effort')}" />
                             <listheader label="${i18n:_('Code')}" visible="@{calendarController.editionController.notResourceCalendar}"/>
+                            <listheader label="${i18n:_('Origin')}" />
                             <listheader label="${i18n:_('Operations')}" />
                         </listhead>
                     </listbox>