A few months ago the online Argentinian rock encyclopedia www.rock.com.ar underwent a revamp where they updated their link formats. Whereas the old links now automatically redirect to the new links, it is impossible to add new discography entries using the new link format, when I tried to do that in a release group, I got this error:
This URL is not allowed for the selected link type, or is incorrectly formatted.

Here is an example of what it used to be:
http://www.rock.com.ar/discos/0/307.shtml

Here is an example of what it is now for that same album:
http://rock.com.ar/artistas/210/discos/307

I think any discography links added using this format should be recognized as "other databases" for release groups:
http://rock.com.ar/artistas/<artist_id>/discos/<album_id>

Thanks!