[Zope] Simple q'n but driving me crazy

[Tom Deprez]

I tried several things but none gave a good result :-(

I've a property sheet call InstanceConstants. Assume there is a property
called 'Category'.

Now how can I automatically fill this value with a string, thus not through
addForm (user intervention)? 

eg. Category = 'TEST' 

I assume this piece of code has to be placed in the _add method, but how
does it look like?

       <dtml-call "REQUEST.set('Category','TEST')"> 

doesn't work and all my other trials with using the propertysheets names
etc don't work either :-( 

Tom.