=== modified file 'account/invoice.py'
--- account/invoice.py	2010-08-05 10:49:43 +0000
+++ account/invoice.py	2010-08-25 12:27:43 +0000
@@ -1278,6 +1278,7 @@
                     tax_grouped[key]['tax_amount'] += val['tax_amount']
 
         for t in tax_grouped.values():
+            t['base'] = cur_obj.round(cr, uid, cur, t['base'])
             t['amount'] = cur_obj.round(cr, uid, cur, t['amount'])
             t['base_amount'] = cur_obj.round(cr, uid, cur, t['base_amount'])
             t['tax_amount'] = cur_obj.round(cr, uid, cur, t['tax_amount'])