diff --git a/weboob/capabilities/base.py b/weboob/capabilities/base.py
index 795ed32a..020308d0 100644
--- a/weboob/capabilities/base.py
+++ b/weboob/capabilities/base.py
@@ -21,13 +21,13 @@
 from weboob.tools.misc import iter_fields
 
 
-__all__ = ['FieldNotFound', 'IBaseCap', 'NotAvailable', 'NotLoaded', 
+__all__ = ['FieldNotFound', 'IBaseCap', 'NotAvailable', 'NotLoaded',
     'CapBaseObject']
 
 
 class FieldNotFound(Exception):
     def __init__(self, obj, field):
-        Exception.__init__(self, 
+        Exception.__init__(self,
             u'Field "%s" not found for object %s' % (field, obj))
 
 
@@ -72,6 +72,10 @@ class CapBaseObject(object):
         self.id = id
         self.backend = backend
 
+    @property
+    def fullid(self):
+        return '%s@%s' % (self.id, self.backend)
+
     def add_field(self, name, type, value=NotLoaded):
         """
         Add a field in list, which needs to be of type @type.