diff --git a/modules/nova/backend.py b/modules/nova/backend.py
index 8c4d6199..a4e7c3b7 100644
--- a/modules/nova/backend.py
+++ b/modules/nova/backend.py
@@ -64,8 +64,7 @@ class NovaBackend(BaseBackend, ICapRadio, ICapCollection):
 
     def iter_resources(self, objs, split_path):
         if Radio in objs:
-            if len(split_path) > 0:
-                raise CollectionNotFound(split_path)
+            self._restrict_level(split_path)
 
             for id in self._RADIOS.iterkeys():
                 yield self.get_radio(id)
diff --git a/modules/ouifm/backend.py b/modules/ouifm/backend.py
index de328274..b0b1d808 100644
--- a/modules/ouifm/backend.py
+++ b/modules/ouifm/backend.py
@@ -48,8 +48,7 @@ class OuiFMBackend(BaseBackend, ICapRadio, ICapCollection):
 
     def iter_resources(self, objs, split_path):
         if Radio in objs:
-            if len(split_path) > 0:
-                raise CollectionNotFound(split_path)
+            self._restrict_level(split_path)
 
             for id in self._RADIOS.iterkeys():
                 yield self.get_radio(id)
diff --git a/modules/radiofrance/backend.py b/modules/radiofrance/backend.py
index 672bfe8b..71e694a3 100644
--- a/modules/radiofrance/backend.py
+++ b/modules/radiofrance/backend.py
@@ -112,7 +112,7 @@ class RadioFranceBackend(BaseBackend, ICapRadio, ICapCollection, ICapVideo):
                 for _id in sorted(self._RADIOS.iterkeys()):
                     if not _id.startswith('fb'):
                         yield self.get_radio(_id)
-                yield Collection(['francebleu'], 'France Bleu')
+                yield Collection([u'francebleu'], u'France Bleu')
             else:
                 raise CollectionNotFound(split_path)
 
diff --git a/modules/redmine/backend.py b/modules/redmine/backend.py
index 0f544214..e1576c51 100644
--- a/modules/redmine/backend.py
+++ b/modules/redmine/backend.py
@@ -96,17 +96,15 @@ class RedmineBackend(BaseBackend, ICapContent, ICapBugTracker, ICapCollection):
     ############# CapCollection ###################################################
     def iter_resources(self, objs, split_path):
         if Project in objs or Issue in objs:
+            self._restrict_level(split_path, 1)
             if len(split_path) == 0:
                 return [Collection([project.id], project.name)
                         for project in self.iter_projects()]
-
-            if len(split_path) == 1:
+            elif len(split_path) == 1:
                 query = Query()
                 query.project = unicode(split_path[0])
                 return self.iter_issues(query)
 
-            raise CollectionNotFound(split_path)
-
     def validate_collection(self, objs, collection):
         if len(collection.split_path) == 0:
             return
diff --git a/weboob/capabilities/bank.py b/weboob/capabilities/bank.py
index 769d0d2a..d9c712a4 100644
--- a/weboob/capabilities/bank.py
+++ b/weboob/capabilities/bank.py
@@ -96,8 +96,7 @@ class Transfer(CapBaseObject):
 class ICapBank(ICapCollection):
     def iter_resources(self, objs, split_path):
         if Account in objs:
-            if len(split_path) > 0:
-                raise CollectionNotFound(split_path)
+            self._restrict_level(split_path)
 
             return self.iter_accounts()
 
diff --git a/weboob/capabilities/bill.py b/weboob/capabilities/bill.py
index 3a3dfff5..442f51fb 100644
--- a/weboob/capabilities/bill.py
+++ b/weboob/capabilities/bill.py
@@ -56,8 +56,7 @@ class Subscription(CapBaseObject):
 class ICapBill(ICapCollection):
     def iter_resources(self, objs, split_path):
         if Subscription in objs:
-            if len(split_path) > 0:
-                raise CollectionNotFound(split_path)
+            self._restrict_level(split_path)
 
             return self.iter_subscription()
 
diff --git a/weboob/capabilities/collection.py b/weboob/capabilities/collection.py
index 5742c89d..c8a93564 100644
--- a/weboob/capabilities/collection.py
+++ b/weboob/capabilities/collection.py
@@ -100,3 +100,7 @@ class ICapCollection(IBaseCap):
             i.next()
         except StopIteration:
             raise CollectionNotFound(collection.split_path)
+
+    def _restrict_level(self, split_path, lmax=0):
+        if len(split_path) > lmax:
+            raise CollectionNotFound(split_path)