diff --git a/addons/sale/wizard/sale_make_invoice_advance.py b/addons/sale/wizard/sale_make_invoice_advance.py
index 98d32fa0e80..5d3cc165b46 100644
--- a/addons/sale/wizard/sale_make_invoice_advance.py
+++ b/addons/sale/wizard/sale_make_invoice_advance.py
@@ -78,7 +78,7 @@ class sale_advance_payment_inv(osv.osv_memory):
         result = []
         for sale in sale_obj.browse(cr, uid, sale_ids, context=context):
             val = inv_line_obj.product_id_change(cr, uid, [], wizard.product_id.id,
-                    uom_id=False, partner_id=sale.partner_id.id, fposition_id=sale.fiscal_position.id)
+                    False, partner_id=sale.partner_id.id, fposition_id=sale.fiscal_position.id)
             res = val['value']
 
             # determine and check income account
@@ -86,7 +86,7 @@ class sale_advance_payment_inv(osv.osv_memory):
                 prop = ir_property_obj.get(cr, uid,
                             'property_account_income_categ', 'product.category', context=context)
                 prop_id = prop and prop.id or False
-                account_id = fiscal_obj.map_account(cr, uid, sale.fiscal_position.id or False, prop_id)
+                account_id = fiscal_obj.map_account(cr, uid, sale.fiscal_position or False, prop_id)
                 if not account_id:
                     raise osv.except_osv(_('Configuration Error!'),
                             _('There is no income account defined as global property.'))