Kernrechtsfrage
Whether the appeal against the mutual legal assistance decision was admissible and whether the complainant had standing as account holder.
Extrahierter Entscheid
The appeal was admissible against the cantonal decision, and the complainant had standing because the transmitted records concerned his bank accounts.
Extrahierte Begründung
Under the applicable mutual assistance provisions, an appeal lies against the final cantonal decision; an account holder whose banking documents are transmitted is directly affected and therefore entitled to complain.