Hi, We had a old version of OTRS running (2.0.4) which we wanted to get up-to-date. After reading the UPGRADE file for 2.1.x, 2.2.x, 2.3.x I decided to do this update incrementally, 2.0.4 -> 2.1.8 -> 2.2.8 -> 2.3.4. The first 2 upgrades (2.0.4 -> 2.1.8 and 2.1.8 -> 2.2.8) went smoothly, no errors or problems were found. We did some brief testing between each update, then did the next one. Our OTRS installation has been running for over 4 years, and since then the database has gotten quite large, the database is around 2.77 GB, the DB upgrades took quite a while but all completed with no errors until I attempted the 2.2.8 -> 2.3.4 upgrade. This is where the problems started. After the 2.3.4 upgrade, despite the database error generated by the migration script "Link already exists between these two objects in opposite direction!" (sorry, I no longer have the exact error, unless the script logged it somewhere) OTRS seemed to work. The only thing that seems to be broken is the FAQ. The errors I got complained of missing columns in the faq_item table. I noticed a pattern that indicated these columns had been renamed and figured that the upgrade script had not completed its work properly, so I renamed them manually: mysql> alter table faq_item change column created_by create_by int(11); Query OK, 5 rows affected (0.01 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> alter table faq_item change column created create_time datetime; Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> alter table faq_item change column changed_by change_by int(11); Query OK, 5 rows affected (0.01 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> alter table faq_item change column changed change_time datetime; Query OK, 5 rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 After renaming the columns in question the table looks like this: mysql> show columns in faq_item; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | f_number | varchar(200) | NO | | | | | f_subject | varchar(200) | YES | | NULL | | | f_name | varchar(200) | NO | UNI | | | | f_language_id | smallint(6) | NO | | 0 | | | state_id | smallint(6) | NO | | 0 | | | category_id | smallint(6) | NO | | 0 | | | f_keywords | text | YES | | NULL | | | f_field1 | text | YES | | NULL | | | f_field2 | text | YES | | NULL | | | f_field3 | text | YES | | NULL | | | f_field4 | text | YES | | NULL | | | f_field5 | text | YES | | NULL | | | f_field6 | text | YES | | NULL | | | free_key1 | varchar(80) | YES | | NULL | | | free_value1 | varchar(200) | YES | | NULL | | | free_key2 | varchar(80) | YES | | NULL | | | free_value2 | varchar(200) | YES | | NULL | | | free_key3 | varchar(80) | YES | | NULL | | | free_value3 | varchar(200) | YES | | NULL | | | free_key4 | varchar(80) | YES | | NULL | | | free_value4 | varchar(200) | YES | | NULL | | | create_time | datetime | YES | | NULL | | | create_by | int(11) | YES | | NULL | | | change_time | datetime | YES | | NULL | | | change_by | int(11) | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ 26 rows in set (0.00 sec) Now the FAQS that previously existed started to show up in the list. The database errors in the system log went away and I was able to create new items without database errors. However, if I try to view any item I get an error page with the following: Software error: Can't locate object method "AllLinkedObjects" via package "Kernel::System::LinkObject" at ../..//Kernel/Modules/FAQ.pm line 514. I'm not too worried about our existing FAQS, there are very few and they are easily re-created, so if deleting the faq_item table and recreating it is a solution I can do that, but I am curious if anyone knows how the database can be properly repaired from the problematic upgrade without losing data. Thanks.