Orientales Omnes Ecclesias §31

³¹ But, as complaints became more and more frequent that young Ruthenian nobles were adopting the Latin rite, the Sacred Congregation of Propaganda by a decree of 7th February 1624 ordered that "in future it should not be lawful for any of the united Ruthenians, whether lay folk or ecclesiastics, secular or regular, and especially monks of St. Basil the Great, to go over to the Latin rite, for any reason, however urgent, without the special permission of the Apostolic See."