PluginLIST - How does "relation" filter work?
I think it's probably tiki.link.semantic or something, there's a list of them here: Object Attributes and Relations.
To check have a look in your database in the table tiki_object_relations, hmm there are lots of tiki.link.xxxx ones in mine, so actually i expect you want tiki.link.alias for this?
HTH
;){kind=link}
;){kind=link}