I'm trying to sync courses via the external db enrollment plugin to moodle. The courses should automatically be put in the right categories.

My external database holds a code like VIE_8, but I tried also numerical values like 8.
The responding category has set its "Category ID number" to VIE_8, too.

When I now try to sync via enrol/database/cli/sync.php I get for many courses the following error:
error: invalid category id, can not create course

Some courses are created, BUT matched to the wrong categories. If my "Category ID number" is 8, it matches the course to course_categories.id with the id 8 instead of course_categories.idnumber

I think it is because enrol/database/lib.php works with the "idnumber" field and the course/database/lib.php works with "id"