Index: openacs-4/packages/bug-tracker/tcl/bug-tracker-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/bug-tracker/tcl/bug-tracker-procs.tcl,v
diff -u -N -r1.43 -r1.44
--- openacs-4/packages/bug-tracker/tcl/bug-tracker-procs.tcl	26 Jul 2014 12:05:12 -0000	1.43
+++ openacs-4/packages/bug-tracker/tcl/bug-tracker-procs.tcl	6 Aug 2014 16:25:19 -0000	1.44
@@ -120,18 +120,18 @@
     ad_page_contract { doc } [bug_tracker::get_page_variables { foo:integer { bar "" } }]
 } {
     set filter_vars {
-        page:integer,optional
+        page:naturalnum,optional
         f_state:integer,optional
         f_fix_for_version:integer,optional
         f_component:integer,optional
         orderby:optional
         {format "table"}
     }
     foreach { parent_id parent_heading } [bug_tracker::category_types] {
-        lappend filter_vars "f_category_$parent_id:integer,optional"
+        lappend filter_vars "f_category_$parent_id:naturalnum,optional"
     }
     foreach action_id [workflow::get_actions -workflow_id [bug_tracker::bug::get_instance_workflow_id]] {
-        lappend filter_vars "f_action_$action_id:integer,optional"
+        lappend filter_vars "f_action_$action_id:naturalnum,optional"
     }
 
     return [concat $filter_vars $extra_spec]