Francisco =?ISO-8859-1?Q?Jos=E9?= Esteban =?ISO-8859-1?Q?Risue=F1o?= writes:

this is the standard behaviour in a HTML form. To avoid this problem we include an line like this:

<dtml-if "REQUEST.has_key('CheckBox_name')"> <dtml-else> <dtml-call "REQUEST.set('CheckBox_name', 'N')"> </dtml-if>

in the method that receives the form data. Alternatively, you may try a default value in your ZSQL argument list, something like:

Arguments: ... Checkbox=0 ... Dieter