Where does violating a rabbinical decree, that isn’t a drabonon and isn’t even universally accepted, fit in? i.e. Cherem Rabbeinu Gershom isn’t a drabonon (it was not instituted by Chazal) and wasn’t universally mekabel by all of klal yisroel. So if someone from a community that had accepted the cherem violates it, what aveira — if any — has he transgressed?
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