[Zope] calling product methods

[Ulrich Wisser]

Hello,

whenevver I try to call a method wich should be acquired
from the product I get a traceback. I have a Yihaw folder.
In the Yihaw Product there is a method YihawNewsItem_add.
But when I try to call

   <dtml-with news>
     <dtml-var "YihawNewsItem_add(REQUEST=REQUEST,RESPONSE=RESPONSE)">
   </dtml-with>

or

   <dtml-var "news.YihawNewsItem_add(REQUEST=REQUEST,RESPONSE=RESPONSE)">

I get a traceback telling me that YihawNewsItem_add is not known.
What is wrong in my picture of how products work?

Thanks

Ulrich
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