[Zope] Calling constructor from another product??

Hi Zopistas out there. How can I call a ZClass-constructor in Product FOO from Product BAR? Here is an outline: Product FOO class XY XY_add . . . Product BAR class A . . . Now my class a prints out a link to /FOO/XY_add to allow users to add new instances of XY. But everytime I get a cant-locate-object error. Is my Link false (I tried several other things aswell) or do I have to set any permissions? Helpless philipp dunkel ** ** ** ** ** ** ** ** pgp public key available gpg public key available ICQ# 60149094