add more comments

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@10189 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Delivery.py

@@ -120,6 +120,9 @@ class Delivery(XMLObject, ImmobilisationDelivery):
         if the `fast` argument is set to a true value, then it use
         SQLCatalog to compute the price, otherwise it sums the total
         price of objects one by one.
+
+        So if the order is not in the catalog, getTotalPrice(fast=1)
+        will return 0, this is not a bug.
       """
       if not fast :
         kw.setdefault( 'portal_type',
@@ -140,6 +143,9 @@ class Delivery(XMLObject, ImmobilisationDelivery):
         if the `fast` argument is set to a true value, then it use
         SQLCatalog to compute the quantity, otherwise it sums the total
         quantity of objects one by one.
+
+        So if the order is not in the catalog, getTotalQuantity(fast=1)
+        will return 0, this is not a bug.
       """
       if not fast :
         kw.setdefault('portal_type',