diff --git a/browser/concept.py b/browser/concept.py
index b0e62ec..7d77447 100644
--- a/browser/concept.py
+++ b/browser/concept.py
@@ -311,7 +311,8 @@ class ConceptView(BaseView):
                         break
                 if skip:
                     continue
-            if IOptions(adapted(r.predicate))('hide_children'):
+            options = IOptions(adapted(r.predicate), None)
+            if options is not None and options('hide_children'):
                 continue
             if fv.check(r.context):
                 yield r
diff --git a/external/README.txt b/external/README.txt
index 357d44c..5005e0f 100644
--- a/external/README.txt
+++ b/external/README.txt
@@ -54,6 +54,19 @@ Creating the corresponding objects
   >>> adMyquery.options
   [u'option1', u'option2']
 
+Importing types
+---------------
+
+  >>> input = ("type('mytype', u'My Type',"
+  ...          "        typeInterface='loops.expert.concept.IQueryConcept')")
+  >>> reader = PyReader()
+  >>> elements = reader.read(input)
+  >>> loader = Loader(loopsRoot)
+  >>> loader.load(elements)
+
+  >>> adapted(concepts['mytype']).typeInterface
+  <InterfaceClass loops.expert.concept.IQueryConcept>
+
 Working with resources
 ----------------------
 
@@ -118,7 +131,7 @@ Extracting elements
   >>> extractor = Extractor(loopsRoot, os.path.join(dataDirectory, 'export'))
   >>> elements = list(extractor.extract())
   >>> len(elements)
-  52
+  53
 
 Writing object information to the external storage
 --------------------------------------------------
diff --git a/external/element.py b/external/element.py
index b9eac6d..f85f6da 100644
--- a/external/element.py
+++ b/external/element.py
@@ -126,6 +126,9 @@ class TypeElement(ConceptElement):
                             loader.typeConcept, **kw)
         instance = self.getInstance(omit=['title', 'typeInterface'])
         formState = instance.applyTemplate(data=kw, ignoreValidation=True)
+        if ti:
+            # overwrite type interface, might have been ignored in addConcept
+            adapted(self.object).typeInterface = kw['typeInterface']
 
 
 class ChildElement(Element):
diff --git a/organize/member.py b/organize/member.py
index 859120c..b51ccf0 100644
--- a/organize/member.py
+++ b/organize/member.py
@@ -74,7 +74,8 @@ class MemberRegistrationManager(object):
         self.createPrincipal(pfName, userId, password, lastName, firstName)
         groups = options(self.groups_key, ())
         self.setGroupsForPrincipal(pfName, userId,  groups=groups)
-        self.createPersonForPrincipal(self, pfName, userId, lastName, firstName=firstName, useExisting=useExisting, **kw)
+        self.createPersonForPrincipal(pfName, userId, lastName, firstName,
+                                      useExisting, **kw)
 
     def createPrincipal(self, pfName, userId, password, lastName,
                               firstName=u'', groups=[], useExisting=False, **kw):
@@ -109,7 +110,8 @@ class MemberRegistrationManager(object):
                     members.append(pFolder.prefix + userId)
                     group.principals = members
 
-    def createPersonForPrincipal(self, pfName, userId, lastName, firstName=u'', useExisting=False, **kw):
+    def createPersonForPrincipal(self, pfName, userId, lastName, firstName=u'',
+                                 useExisting=False, **kw):
         concepts = self.context.getConceptManager()
         personType = adapted(concepts[self.person_typeName])
         pFolder = getPrincipalFolder(self.context, pfName)