show category reference if present

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27387 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/Account_getGapItemList.xml

@@ -64,7 +64,7 @@ display_cache = {}\n
 \n
 def display(x):\n
   if x not in display_cache:\n
-    gap_id = x.getId()\n
+    gap_id = x.getReference() or x.getId()\n
     if gap_id.isdigit():\n
       display_cache[x] = "%s - %s" % (gap_id, x.getTitle())\n
     else:\n

bt5/erp5_accounting/bt/revision

-936
+937
\ No newline at end of file