diff --git a/addons/product/pricelist.py b/addons/product/pricelist.py
index 8f458ec2b89..db24e3a5e15 100644
--- a/addons/product/pricelist.py
+++ b/addons/product/pricelist.py
@@ -19,6 +19,7 @@
 #
 ##############################################################################
 
+from itertools import chain
 import time
 
 from openerp import tools
@@ -224,7 +225,9 @@ class product_pricelist(osv.osv):
         is_product_template = products[0]._name == "product.template"
         if is_product_template:
             prod_tmpl_ids = [tmpl.id for tmpl in products]
-            prod_ids = [product.id for product in tmpl.product_variant_ids for tmpl in products]
+            # all variants of all products
+            prod_ids = [p.id for p in
+                        list(chain.from_iterable([t.product_variant_ids for t in products]))]
         else:
             prod_ids = [product.id for product in products]
             prod_tmpl_ids = [product.product_tmpl_id.id for product in products]