[Zope] NameError when rendering a zsql-method in a dtml-method in a dtml-method

maybe this is a simple problem, but not to me as a beginner... when rendering a dtml-method which renders itself a dtml-method which calls zsql-method i get the following: ErrorError Type: NameError Error Value: There is no variable named 'name_of_zsql_method' simple namespace problem? playing around with "dtml-with" did not help. please help me. thanks in advance. Andreas Hölzl