Cardinal Sean O’Malley has barred a prominent Austrian priest from speaking in a Roman Catholic parish in the Archdiocese of Boston because the priest advocates the ordination of women and married men as one solution to the priest shortage. The appearance by the priest, the Rev. Helmut Schüller in Boston on July 17 is part of a cross-country speaking tour sponsored by 10 liberal Catholic groups that are pressing the church for change. The Archdiocese of Boston said that its policy, like the practice in other dioceses, is to prohibit individuals who promote “positions that are contrary to Catholic teachings” from speaking in Catholic parishes and at church events. Father Schüller helped lead an “Appeal to Disobedience” backed by about 400 priests and deacons in 2011, and was later stripped of his formal title of monsignor. His talk in Boston has been moved to a Unitarian Universalist church, but he is scheduled to speak at a Catholic parish in Detroit and a Catholic college in Pennsylvania.