1. Click http://musicbrainz.org/artist/1f245b43-f9ba-4d02-a70b-cd08a99cd1c9/relate
2. We are now in state of merging with AJICO
3. Click http://musicbrainz.org/artist/1f245b43-f9ba-4d02-a70b-cd08a99cd1c9/relate again
4. ISE : « A relationship requires 2 different entities »

Instead of a cryptic error saying that we can't link 2 same entities, we could keep the status of point 2.

I put trivial as it is rarely happening (only when first click didn't respond in good time but had still taken effect. Or when on slow network we click twice etc.