Council of Trent: Session XIV, Reformation, Chapter XI

CHAPTER XI. Those transferred to another order shall remain under obedience in enclosure, and shall be incapable of Secular Benefices.

But forasmuch as Regulars, after being transferred from one order to another, ordinarily obtain permission easily from their superior to remain out of their monastery, whereby occasion is given of their wandering about and apostatizing; no prelate or superior of any order shall be allowed, by virtue of any faculty whatsoever, to admit any individual to the habit and to profession, except with the view that he shall remain perpetually in enclosure under obedience to his own superior, in the order itself to which he is transferred; and one so transferred, even though he be a canon Regular, shall be wholly incapable of Secular Benefices, even of cures.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).