diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index a5908cb78ec..22a033cd2f5 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -941,7 +941,7 @@ class purchase_order_line(osv.osv):
     def unlink(self, cr, uid, ids, context=None):
         procurement_ids_to_cancel = []
         for line in self.browse(cr, uid, ids, context=context):
-            if line.state not in ['draft', 'cancel']:
+            if line.order_id.state in ['approved', 'done'] and line.state not in ['draft', 'cancel']:
                 raise osv.except_osv(_('Invalid Action!'), _('Cannot delete a purchase order line which is in state \'%s\'.') %(line.state,))
             if line.move_dest_id:
                 procurement_ids_to_cancel.extend(procurement.id for procurement in line.move_dest_id.procurements)
diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 249257f1092..38fa76f509f 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -31,6 +31,7 @@ except ImportError:
 import openerp
 import openerp.modules.registry
 from openerp.tools.translate import _
+from openerp.tools import ustr
 from openerp import http
 
 from openerp.http import request, serialize_exception as _serialize_exception, LazyResponse
@@ -567,14 +568,14 @@ def xml2json_from_elementtree(el, preserve_whitespaces=False):
     return res
 
 def content_disposition(filename):
-    filename = filename.encode('utf8')
-    escaped = urllib2.quote(filename)
+    filename = ustr(filename)
+    escaped = urllib2.quote(filename.encode('utf8'))
     browser = request.httprequest.user_agent.browser
     version = int((request.httprequest.user_agent.version or '0').split('.')[0])
     if browser == 'msie' and version < 9:
         return "attachment; filename=%s" % escaped
     elif browser == 'safari':
-        return "attachment; filename=\"%s\"" % filename
+        return u"attachment; filename=%s" % filename
     else:
         return "attachment; filename*=UTF-8''%s" % escaped