Index: trunk/ippTools/share/difftool_definewarpwarp_insert.sql
===================================================================
--- trunk/ippTools/share/difftool_definewarpwarp_insert.sql	(revision 23503)
+++ trunk/ippTools/share/difftool_definewarpwarp_insert.sql	(revision 23504)
@@ -4,7 +4,7 @@
     skycell_id,
     %s,                         -- input warp_id
-    0,                          -- input stack_id
+    NULL,                       -- input stack_id
     %s,                         -- template warp_id
-    0,                          -- template stack_id
+    NULL,                       -- template stack_id
     tess_id,
     0                           -- diff_skyfile_id