follow_up replaces aggregate.

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

@@ -58,7 +58,7 @@ else:\n
 if delivery_line is not None:\n
   software_release = delivery_line.getAggregateValue(portal_type=\'Software Release\')\n
   if software_release is not None:\n
-    software_product = software_release.getAggregateValue()\n
+    software_product = software_release.getFollowUpValue()\n
     if software_product is not None:\n
       return "%s/index_html" % software_product.getDefaultImageAbsoluteUrl()\n
 </string> </value>