But I have another idea. Here is a code sequence I use:

... <dtml-in "SQL.sqlMitarbeiter(Abteilung=Abteilungsname)"> <dtml-if sequence-even> <tr bgcolor="<dtml-var Zeilenfarbe>"> <dtml-else> <tr> </dtml-if> ...

As you can see Zeilenfarbe is referenced within a dtml-in statement. Is it possible that dtml-in changes the namespace? SQL is another folder beneath / that holds most of my ZSQL stuff... And if so, how can I force to use the local namespace?

Me too. What makes me wonder is the fact, that this has worked some time ago and I do not know what I have done to break it.

Aha, Right, these two sections suggest to me you are suffering from the problems with ZSQL methods in 2.1.6. Take a look at the following and see if it helps: http://zope.nipltd.com/public/lists/zope-archive.nsf/ByKey/8347052C9F353CA2 cheers, Chris