This is bogus. Geoff Horton investigated many of these claims and found them all to be false.Phoneman777 said:These words appeared in the Roman Canon Law: "To believe that our Lord God the Pope has not the power to decree as he is decreed, is to be deemed heretical.-I?ithe Gloss "Extravagantes" o.f Pope John XXII Cum inter, Tit. XIV, Cap. IV. Ad Callem Sexti Decretalium, Paris, 1685
In this case:
1) the quote does not appear in the original of the Extravagantes.
2) it appeared in a printed edition 300 years later as a gloss (commentary) not part of the text itself.
3) even if it were to have been in the original it would have no force of (canon) law, Canon Law is not doctrinal.
So we have a comment by an unknown person, added 300 years later, and of no validity even if in the original.