Correct a typo error.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3721 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/InvoicingRule.py

@@ -101,7 +101,7 @@ class InvoicingRule(Rule):
           quantity = my_context_movement.getQuantity(),
           quantity_unit = my_context_movement.getQuantityUnit(),
           efficiency = my_context_movement.getEfficiency(),
-          resource = my_context_movement.getresource(),
+          resource = my_context_movement.getResource(),
           variation_category_list = my_context_movement.\
                                             getVariationCategoryList(),
           start_date = my_context_movement.getStartDate(),