Index: openacs-4/packages/acs-admin/www/users/merge.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-admin/www/users/merge.tcl,v
diff -u -r1.5 -r1.5.10.1
--- openacs-4/packages/acs-admin/www/users/merge.tcl	30 Nov 2007 18:16:42 -0000	1.5
+++ openacs-4/packages/acs-admin/www/users/merge.tcl	5 Aug 2014 10:08:56 -0000	1.5.10.1
@@ -5,7 +5,7 @@
 
     @cvs-id $Id$
 } {
-    user_id
+    user_id:naturalnum,notnull
     user_id_from_search
 } -properties {
     context:onevalue