Checkout Moodle 2.2 Create a course with at least 3 sections In section 1 Fake some duplicate course_section records in the database. This is how I did it: Check there are two sections in 2 and 3: integration=# select * from mdl_course_sections where section = 2 or section = 3 and course = 2; id | course | section | name | summary | summaryformat | sequence | visible ----+--------+---------+------+---------+---------------+----------+--------- 4 | 2 | 2 | | | 1 | | 1 5 | 2 | 3 | | | 1 | | 1 (2 rows) Update one of the records to be a duplicate course-section: integration=# update mdl_course_sections set section = 3 where section = 2; UPDATE 1 Verify the duplicate is there: integration=# select * from mdl_course_sections where section = 3 and course = 2; id | course | section | name | summary | summaryformat | sequence | visible ----+--------+---------+------+---------+---------------+----------+--------- 5 | 2 | 3 | | | 1 | | 1 4 | 2 | 3 | | | 1 | | 1 (2 rows) Upgrade to 2.3