Je viens de tombre sur un bulletin de maintenance du site.
"Here it is, from RE.NET news feed.
10.04.2012RESIDENT EVIL.NET Maintenance Bulletin
22:10 (JST) October 4th, 2012
Resolved:
- Account linking has been fixed and should be working normally.
Issues:
- Server congestion may cause a delay in your uploaded data appearing on the site.
Under maintenance:
- Partner feature is still being worked on.
IMPORTANT INFORMATION:
If you DELETE your CAPCOM account, you will not be able to LINK the same PSN or Xbox Live ID to a new CAPCOM Account for 7 days."
Source: http://www.capcom-unity.com/resident_evil/go/thread/view/7391/29411345/error-u0004-this-id-has-already-been-registered&pg=last&524766777