diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeCRUDController.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeCRUDController.java
index 37a4ec46f..7a07273ea 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeCRUDController.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeCRUDController.java
@@ -260,4 +260,8 @@ public class AdvanceTypeCRUDController extends GenericForwardComposer {
         save();
     }
 
+    public boolean isImmutable() {
+        return advanceTypeModel.isImmutable();
+    }
+
 }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
index 7e8a0fc8b..0bbbca1f2 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/AdvanceTypeModel.java
@@ -78,7 +78,7 @@ public class AdvanceTypeModel implements IAdvanceTypeModel {
     @Transactional(readOnly = true)
     public void prepareForEdit(AdvanceType advanceType) {
         Validate.notNull(advanceType);
-        checkCanBeModified(advanceType);
+        // checkCanBeModified(advanceType);
         this.advanceType = getFromDB(advanceType);
     }
 
@@ -176,4 +176,12 @@ public class AdvanceTypeModel implements IAdvanceTypeModel {
         }
     }
 
+    @Override
+    public boolean isImmutable() {
+        if (advanceType == null) {
+            return false;
+        }
+        return advanceType.isImmutable();
+    }
+
 }
diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/IAdvanceTypeModel.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/IAdvanceTypeModel.java
index 270cf5ad2..28fe83afb 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/IAdvanceTypeModel.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/advance/IAdvanceTypeModel.java
@@ -123,4 +123,6 @@ public interface IAdvanceTypeModel {
     void setPercentage(Boolean percentage);
 
     Boolean getPercentage();
+
+    boolean isImmutable();
 }
diff --git a/navalplanner-webapp/src/main/webapp/advance/_editAdvanceTypes.zul b/navalplanner-webapp/src/main/webapp/advance/_editAdvanceTypes.zul
index c34bf586f..c49b32f32 100644
--- a/navalplanner-webapp/src/main/webapp/advance/_editAdvanceTypes.zul
+++ b/navalplanner-webapp/src/main/webapp/advance/_editAdvanceTypes.zul
@@ -34,11 +34,13 @@
                     <rows>
                         <row>
                             <label value="${i18n:_('Unit name')}" />
-                            <textbox value="@{controller.advanceType.unitName}" constraint="@{controller.distinctNames}" width="300px"/>
+                            <textbox value="@{controller.advanceType.unitName}" constraint="@{controller.distinctNames}" width="300px"
+                                disabled="@{controller.immutable}" />
                         </row>
                         <row>
                             <label value="${i18n:_('Active')}" />
-                            <checkbox checked="@{controller.advanceType.active}"/>
+                            <checkbox checked="@{controller.advanceType.active}"
+                                disabled="@{controller.immutable}" />
                         </row>
                         <row>
                             <label value="${i18n:_('Default max value')}" />
@@ -49,7 +51,8 @@
                         <row>
                             <label value="${i18n:_('Precision')}" />
                             <decimalbox id="precision" scale="4"
-                                value = "@{controller.advanceType.unitPrecision}" constraint = "@{controller.lessThanDefaultMaxValue}"/>
+                                value = "@{controller.advanceType.unitPrecision}" constraint = "@{controller.lessThanDefaultMaxValue}"
+                                disabled="@{controller.immutable}" />
                         </row>
                         <row>
                             <label value="${i18n:_('Type')}" />
@@ -57,7 +60,8 @@
                         </row>
                         <row>
                             <label value="${i18n:_('Percentage')}" />
-                            <checkbox id="percentage" checked="@{controller.percentage}" />
+                            <checkbox id="percentage" checked="@{controller.percentage}"
+                                disabled="@{controller.immutable}" />
                         </row>
                     </rows>
                 </grid>
@@ -67,10 +71,12 @@
 
     <button onClick="controller.saveAndExit();"
         label="${arg.save_button_label}"
-        sclass="save-button global-action"/>
+        sclass="save-button global-action"
+        disabled="@{controller.immutable}" />
     <button onClick="controller.saveAndContinue();"
         label="${arg.save_and_continue_button_label}"
-        sclass="save-button global-action"/>
+        sclass="save-button global-action"
+        disabled="@{controller.immutable}" />
     <button onClick="controller.cancel();"
         label="${arg.cancel_button_label}"
         sclass="cancel-button global-action" />
diff --git a/navalplanner-webapp/src/main/webapp/advance/_listAdvanceTypes.zul b/navalplanner-webapp/src/main/webapp/advance/_listAdvanceTypes.zul
index 5846f0791..93a3eeb4e 100644
--- a/navalplanner-webapp/src/main/webapp/advance/_listAdvanceTypes.zul
+++ b/navalplanner-webapp/src/main/webapp/advance/_listAdvanceTypes.zul
@@ -36,7 +36,7 @@
                 <hbox>
                     <button sclass="icono" image="/common/img/ico_editar1.png"
                         hoverImage="/common/img/ico_editar.png"
-                        tooltiptext="${i18n:_('Edit')}" disabled="@{advanceType.immutable}" onClick="controller.goToEditForm(self.parent.parent.value);">
+                        tooltiptext="${i18n:_('Edit')}" onClick="controller.goToEditForm(self.parent.parent.value);">
                     </button>
                     <button sclass="icono" image="/common/img/ico_borrar1.png"
                         hoverImage="/common/img/ico_borrar.png"