[xwiki-users] Data migration R40000XWIKI6990 fails with duplicate key error

Hi, I'm trying to upgrade from XWiki 3.1 to 4.4, but I'm having problems with the data migration process. It all goes well up until R40000XWIKI6990, which fails due to a duplicate key (see below, full Tomcat log also attached). It also fails with safemode enabled. ERROR o.h.u.JDBCExceptionReporter - ERROR: duplicate key value violates unique constraint "xwikidoc_pkey" I've tried running SQL commands from XWIKI-8129 [1] jira issue too, but it doesn't apply any modification in my case. So it doesn't make any difference. Older version of XWiki in-between also fail. The system set up is: Fedora 14 (x86_64) Java 1.6.0_20 -- OpenJDK Runtime Environment (IcedTea6 1.9.10) Tomcat 6 PostgreSQL 8.4.9 XWiki 3.1 (upgraded from 2.2.1 and with no configuration options changes) Any idea of how to solve this problem? Thanks, Àlex [1] http://jira.xwiki.org/browse/XWIKI-8129