Index: openacs-4/packages/acs-subsite/www/members/make-member.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/members/make-member.tcl,v
diff -u -N -r1.3 -r1.3.20.1
--- openacs-4/packages/acs-subsite/www/members/make-member.tcl	3 Dec 2003 23:38:27 -0000	1.3
+++ openacs-4/packages/acs-subsite/www/members/make-member.tcl	5 Aug 2014 09:49:25 -0000	1.3.20.1
@@ -1,7 +1,7 @@
 ad_page_contract {
     Make ordinary members.
 } {
-    {user_id:multiple ""}
+    {user_id:naturalnum,multiple ""}
 }
 
 set group_id [application_group::group_id_from_package_id]