[Zope] strange behaviour of ZSQL methods

Hi listies, something strange is happening with my ZSQL methods. I have a huge query that works great when testing it in the management-interface - it returns about 10 records or so. but when I implement it into a dtml-method getting the parameters via X-Y-GMX: $flush REQUEST as usual, I am getting the whole database in return. I'm quite sure that it's my own fault, so I'd like to see the translated SQL-query in the dtml-method to check for the wrong fields. Is there a tag for it like: <dtml-var MyZSQLQuery showRenderedSQLsource> ? This problem drives me nuts since already two days :-(( Martin