diff -r b38d2dfd7ba4 tryton/tryton/gui/window/attachment.py
--- a/tryton/tryton/gui/window/attachment.py	Tue Jun 07 11:25:03 2016 +0200
+++ b/tryton/tryton/gui/window/attachment.py	Tue Jun 07 11:26:00 2016 +0200
@@ -22,7 +22,6 @@
             ], mode=['tree', 'form'], context=context,
             exclude_field='resource')
         screen.search_filter()
-        screen.parent = record
         super(Attachment, self).__init__(screen, self.callback,
             view_type='tree')
 
diff -r b38d2dfd7ba4 tryton/tryton/gui/window/view_form/screen/screen.py
--- a/tryton/tryton/gui/window/view_form/screen/screen.py	Tue Jun 07 11:25:03 2016 +0200
+++ b/tryton/tryton/gui/window/view_form/screen/screen.py	Tue Jun 07 11:26:00 2016 +0200
@@ -338,7 +338,8 @@
                 'ids': [self.id_get()],
                 }, context=self.context.copy(), warning=False)
         else:
-            self.switch_view(view_type='form')
+            if not self.modified():
+                self.switch_view(view_type='form')
             return True
 
     @property
@@ -347,8 +348,6 @@
 
     def switch_view(self, view_type=None):
         if self.current_view:
-            if not self.parent and self.modified():
-                return
             self.current_view.set_value()
             if (self.current_record and
                     self.current_record not in self.current_record.group):