You haven’t provided many details and I know next to nothing about Swedish criminal law so I am not sure I will be able to provide a comprehensive answer to all your questions but I can at least say two things about bans and how they are enforced in the EU:
Since the borders between them are open, Schengen countries share a database where they can register bans to make sure the relevant people are stopped at the Schengen external border no matter where they enter. Presently, it isn’t technically mandatory for Sweden to register all bans there but it’s very likely your son’s ban would have been registered (and that’s the way the system is intended to work).
Denmark participates in this system as well so if there is an alert it would indeed also apply there and show up on the Danish border guards’ screen.
Under EU and Swedish rules, your son also has a right to access the data about him and to request changes if they are inaccurate or unlawful (but obviously not to have his name removed if the ban was proper). The request has to go through the Swedish Police Authority and requests in English are accepted. Details in this guide.
Credit:stackoverflow.com‘
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