I'm using Zope 2.5.1 (and can't upgrade for the time being). If this has been fixed in a later version, my apologies for the needless request. When a ZSQL method is called without a required input parameter, it generates an error like Missing input variable, group_id Since such methods might be called indirectly, it's not always obvious which ZSQL method was called or who called it. I would find it helpful if the error message included at least the name of the called method. Ideally, traceback information should be available as well. This particular message seems to be generated by something other than the usual error machinery. -- Skip Montanaro - skip@pobox.com http://www.mojam.com/ http://www.musi-cal.com/