latinmassmagazine.com/articles/articles_1999_FA_Woods.html
A group of priests who until then belonged to the Society approached the Vatican to found an order of priests in full union with the Holy See that would be dedicated to offering the Mass and sacraments according to the liturgical books of 1962. Crucial to its founding was the Vatican’s guarantee that Fraternity priests could use the old rite exclusively. This was the agreement that Fr. Josef Bisig, who would become the order’s superior general, and fifteen other Lefebvre priests, believed they had reached with Cardinal Ratzinger and Pope John Paul II. Oddly, when the Fraternity’s constitution, based on this agreement and containing the words “exclusive use,” was submitted, the Pontifical Commission Ecclesia Dei refused to accept the use of the word “exclusive.” In retrospect, the matter should have been settled right then, to guarantee the terms of the original agreement in clearer language. In any event,
the Fraternity’s final constitutions were never approved, but the substance of what had been agreed to was generally understood by everyone involved; so much so that Fraternity priests who offered the new Mass in violation of their interim constitution were disciplined. (Why such men were ordained to this order is a good and pregnant question.) …(num: my emphasis).