Index: openacs-4/packages/ams/tcl/ams-procs-postgresql.xql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/ams/tcl/ams-procs-postgresql.xql,v
diff -u -r1.18 -r1.19
--- openacs-4/packages/ams/tcl/ams-procs-postgresql.xql	1 Dec 2005 11:01:07 -0000	1.18
+++ openacs-4/packages/ams/tcl/ams-procs-postgresql.xql	31 Jan 2006 00:54:50 -0000	1.19
@@ -62,7 +62,8 @@
                  attribute_id,
                  value_id
             from ams_attribute_values
-           where object_id = :from )
+           where object_id = :from 
+             and attribute_id not in ( select attribute_id from ams_attribute_values where object_id = :to ))
   </querytext>
 </fullquery>