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The biggest problem with the current approach in our
installation
are multilinks: the web interface shows retired nodes in the
text box
for such a multilink, but when commiting a change the
retired nodes
cause an error.

Traceback (most recent call last):
  File
"/Projects/psp/roundup/stable/lib/python2.1/site-packages/roundup/cgi_client.py",
line 576, in shownode
    props = parsePropsFromForm(self.db, cl, self.form,
self.nodeid)
  File
"/Projects/psp/roundup/stable/lib/python2.1/site-packages/roundup/cgi_client.py",
line 1353, in parsePropsFromForm
    raise ValueError, _('property "%(propname)s": '
ValueError: property "product": "ASCI_251" not an entry of
product

The workaround at the moment is to remove the offending 
"product" from the list before commiting changes, but roundup
itself should be able to handle this. I think it is okay to
display retired nodes, but then the parsePropsFromForm()
must accept them, too.

Any suggestions?