diff --git a/bin/osv/fields.py b/bin/osv/fields.py
index ce02de20a27..19735857680 100644
--- a/bin/osv/fields.py
+++ b/bin/osv/fields.py
@@ -81,6 +81,7 @@ class _column(object):
         self.select = select
         self.selectable = True
         self.group_operator = args.get('group_operator', False)
+        self.parent_field = args.get('parent_field', False)
         for a in args:
             if args[a]:
                 setattr(self, a, args[a])
@@ -365,7 +366,8 @@ class one2many(_column):
     _prefetch = False
     _type = 'one2many'
 
-    def __init__(self, obj, fields_id, string='unknown', limit=None, **args):
+    def __init__(self, obj, fields_id, string='unknown', limit=20, **args):
+        args.update({'parent_field':fields_id})
         _column.__init__(self, string=string, **args)
         self._obj = obj
         self._fields_id = fields_id
diff --git a/bin/osv/orm.py b/bin/osv/orm.py
index 2bf846d631d..83934f8b1a2 100644
--- a/bin/osv/orm.py
+++ b/bin/osv/orm.py
@@ -1008,7 +1008,7 @@ class orm_template(object):
                     continue
                 res[f] = {'type': self._columns[f]._type}
                 for arg in ('string', 'readonly', 'states', 'size', 'required', 'group_operator',
-                        'change_default', 'translate', 'help', 'select', 'selectable'):
+                        'change_default', 'translate', 'help', 'select', 'selectable','parent_field'):
                     if getattr(self._columns[f], arg):
                         res[f][arg] = getattr(self._columns[f], arg)
                 if not read_access: