Reset date only when present.

master/bt5/vifib_slap/SkinTemplateItem/portal_skins/vifib_slap/Person_getOpenOrderDifference.xml

@@ -96,6 +96,7 @@ for start_date_tuple in start_date_tuple_list:\n
     line = previous_open_sale_order[line_id]\n
     if line.getStartDate() is None:\n
       modify_kw_kw[line.getAggregate(portal_type=\'Hosting Subscription\')] = {\'start_date\': start_date}\n
+    else:\n
       # reset start_date to possibly already set up on Open Order Line\n
       start_date = line.getStartDate()\n
   elif start_date_tuple[0] in add_kw_kw:\n

master/bt5/vifib_slap/bt/revision

-673
+674
\ No newline at end of file