As discussed in https://moodle.org/mod/forum/discuss.php?d=416830

PROBLEM

French administration publishes programs with competencies at different depths:

1. Domain
   1. Competencies
2. Domain
   1. Domain
      1. Competencies
3. Domain
   1. Domain
      1. Domain

1. 1. 1. 1. Competencies

PROPOSITION

Add a column in mdl_competencies to include the taxonomy of this item if it overrides the main taxonomy of the framework.