Index: trunk/ippTools/share/difftool_definestackstack_part1.sql
===================================================================
--- trunk/ippTools/share/difftool_definestackstack_part1.sql	(revision 34443)
+++ trunk/ippTools/share/difftool_definestackstack_part1.sql	(revision 41681)
@@ -27,7 +27,7 @@
      	   skycell_id,
 	   filter
-) AS template ON stackRun.filter = template.filter 
-              AND stackRun.tess_id = template.tess_id 
+) AS template ON stackRun.tess_id = template.tess_id 
 	      AND stackRun.skycell_id = template.skycell_id 
+	      @FILT1_QUERY@  -- include filter constraint if requested
 LEFT JOIN (
      SELECT