IN this article https://en.numista.com/forum/topic54585.html it says the Papal Scudo was created in 1588, and for Papal States - Rome, the Numista currencies reflect this, with the Soldo as currency in the 12th - early 16th centuries, and the Scudo after (though with a small gap).
But we have coins of other Papal States (Ancona, Ascoli, Fermo, Macerata, etc.) struck before 1500, which could not have been on the scudo:
I understand that Bologna kept a different system than Rome, so the large number of Bologna coins does not need to be considered.
And there are not a lot of coins in these other places (maybe a dozen, all in Marche, I think).
I don't have any of the relevant catalogs, so I don't have a good solution to offer. But just wanted to point out this small inconsistency (since I am occasionally adding early coins that I am fairly sure should not be on the scudo currency system).