I can assure you that it *does* work for the scenario that you describe, as long as you configure it right. We are using the external database enrolment in our university (for the last 6 years) and students have several records in the external enrolment table (as many as courses they are supposed to be taking )
On the other hand, even if the table can't be changed, you can always create a new read-only view with the data in the format you need (in fact, that's what we did for several years, creating a view from several tables in our SIS database).
Por cierto, a juzgar por tu nombre diría que hablas español (y casi seguro que catalán también )
External DB enrollment, enroll one user in multiple courses
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