Index: openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl,v
diff -u -r1.10 -r1.10.2.1
--- openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl	7 Aug 2017 23:48:05 -0000	1.10
+++ openacs-4/packages/calendar/www/cal-item-create-recurrence.tcl	11 Mar 2021 10:48:35 -0000	1.10.2.1
@@ -47,10 +47,12 @@
 ad_form -name cal_item  -export {return_url} -form {
     {cal_item_id:key}
 
-    {every_n:integer,optional
+    {every_n:integer(number),optional
         {label "[_ calendar.Repeat_every]"}
         {value 1}
-        {html {size 4}} 
+        {html
+            {size 4 min 1}
+        }
     }
 
     {interval_type:text(radio)