diff --git a/news/83.bugfix b/news/83.bugfix
new file mode 100644
index 0000000..d2c8c4d
--- /dev/null
+++ b/news/83.bugfix
@@ -0,0 +1 @@
+The dexterity editor does not allow editing portal types derived by a schema because that has no persistent effect
\ No newline at end of file
diff --git a/plone/schemaeditor/browser/schema/listing.py b/plone/schemaeditor/browser/schema/listing.py
index 6a6152e..dde0105 100644
--- a/plone/schemaeditor/browser/schema/listing.py
+++ b/plone/schemaeditor/browser/schema/listing.py
@@ -29,6 +29,7 @@ class SchemaListing(AutoExtensibleForm, form.Form):
     showEmptyGroups = True
     template = ViewPageTemplateFile('schema_listing.pt')
     ignoreRequiredOnExtract = True
+    read_only = False
 
     @property
     def schema(self):
@@ -136,11 +137,14 @@ def handleSaveDefaults(self, action):
 
 class ReadOnlySchemaListing(SchemaListing):
     buttons = button.Buttons()
+    read_only = True
 
     def edit_url(self, field):
         return
     delete_url = edit_url
 
+    def protected_field(self, field):
+        return True
 
 class SchemaListingPage(FormWrapper):
 
diff --git a/plone/schemaeditor/browser/schema/schema_listing.pt b/plone/schemaeditor/browser/schema/schema_listing.pt
index a433394..bc8759e 100644
--- a/plone/schemaeditor/browser/schema/schema_listing.pt
+++ b/plone/schemaeditor/browser/schema/schema_listing.pt
@@ -1,18 +1,24 @@
 <div xmlns:tal="http://xml.zope.org/namespaces/tal"
      xmlns:metal="http://xml.zope.org/namespaces/metal"
      xmlns:i18n="http://xml.zope.org/namespaces/i18n"
-     tal:omit-tag="" i18n:domain="plone">
-  <a id="add-field" class="pat-plone-modal"
-     href="${context/absolute_url}/@@add-field">
-    <button style="float: right; display: block;"
-           i18n:translate="add_new_field_hellip">Add new field&hellip;</button>
-  </a>
-
-  <a id="add-fieldset" class="pat-plone-modal" tal:condition="context/enableFieldsets"
-     href="${context/absolute_url}/@@add-fieldset">
-    <button style="float: right; display: block;"
-           i18n:translate="add_fieldset_hellip">Add new fieldset&hellip;</button>
-  </a>
+     tal:define="read_only python:view.read_only"
+     tal:omit-tag=""
+     i18n:domain="plone"
+>
+
+  <tal:editable condition="not: read_only">
+    <a id="add-field" class="pat-plone-modal"
+      href="${context/absolute_url}/@@add-field">
+      <button style="float: right; display: block;"
+            i18n:translate="add_new_field_hellip">Add new field&hellip;</button>
+    </a>
+
+    <a id="add-fieldset" class="pat-plone-modal" tal:condition="context/enableFieldsets"
+      href="${context/absolute_url}/@@add-fieldset">
+      <button style="float: right; display: block;"
+            i18n:translate="add_fieldset_hellip">Add new fieldset&hellip;</button>
+    </a>
+  </tal:editable>
 
   <metal:form metal:use-macro="context/@@ploneform-macros/form">
     <metal:top-slot metal:fill-slot="formtop">