[Zope] acquisition

[Arenz, Ralph]

Hi,

After upgrading from Zope-2.6.4 to Zope-2.7.3 i get the following error
when i try to add an object from the add-list in zmi:

Unauthorized: You are not allowed to access '<property-name>' in this
context
 (Also, an error occurred while attempting to render the standard error
message.) 

The property belongs to the container-object, where i try to add the new
instance, and is called
via "dtml-var" in the constructor-method, which is a dmtlmethod,  of the
ZClass. 
When i try to access that property in the constructor-method with
this().<property>
or restrictedTraverse('<property>') it works fine. 
Same behaviour with Zope-2.7.4. At the moment i'am running out of ideas. I
changed some 
permissions but that doesn't work. At the moment i'am not shure if that
behaviour 
is a bug or a feature?

Any ideas?

regards 

ralph