Re: [Zope] Calling constructor from another product??

Now my class a prints out a link to /FOO/XY_add to allow users to add new instances of XY.

You should try: manage_addProduct/FOO/XY_add in the link, instead of /FOO/XY_add A url such as http://.../my/folderish/manage_addProduct/FOO/XY_add calls the zclass constructor for adding an XY object under the 'folderish' folder. You can see this if you open the 'contents' management screen of a folder in a new window and try to add any object.

Is my Link false (I tried several other things aswell) or do I have to set any permissions?

This doesn't seem to be the problem (yet). If you don't have permissions you would see the http authentication login box. Hope this helps, Shalabh