Index: openacs-4/packages/workflow/www/admin/workflow-graph.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/workflow/www/admin/workflow-graph.tcl,v
diff -u -N -r1.3 -r1.4
--- openacs-4/packages/workflow/www/admin/workflow-graph.tcl	26 Oct 2011 01:11:55 -0000	1.3
+++ openacs-4/packages/workflow/www/admin/workflow-graph.tcl	6 Aug 2014 16:34:03 -0000	1.4
@@ -4,7 +4,7 @@
     @creation-date 4/5/2005
     @cvs-id  $Id$
 } {
-    {workflow_id}
+    {workflow_id:naturalnum,notnull}
     {states_to_highlight ""}
 }