diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 076c622d3f3..7c3a05dad98 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -1029,7 +1029,7 @@ class purchase_order_line(osv.osv):
 
     def unlink(self, cr, uid, ids, context=None):
         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,))
         procurement_obj = self.pool.get('procurement.order')
         procurement_ids_to_except = procurement_obj.search(cr, uid, [('purchase_line_id', 'in', ids)], context=context)
diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 774b9cda712..3ebbfb02af6 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -35,6 +35,7 @@ from openerp.addons.base.ir.ir_qweb import AssetsBundle, QWebTemplateNotFound
 from openerp.modules import get_module_resource
 from openerp.tools import topological_sort
 from openerp.tools.translate import _
+from openerp.tools import ustr
 from openerp import http
 
 from openerp.http import request, serialize_exception as _serialize_exception
@@ -443,14 +444,14 @@ 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