In a 25-page letter delivered to Francis last month and provided Saturday to The Associated Press, the 62 signatories issued a "filial correction" to the pope — a measure they said hadn't been employed since the 14th century.
The letter accused Francis of propagating seven heretical positions concerning marriage, moral life and the sacraments with his 2016 document "The Joy of Love" and subsequent "acts, words and omissions."
The initiative follows another formal act by four tradition-minded cardinals who wrote Francis last year asking him to clarify a series of questions, or "dubbia," they had about his 2016 text.
Francis hasn't responded to either initiative. The Vatican spokesman didn't immediately respond to an email seeking comment late Saturday.