Question juridique clé
Whether Z. had standing to challenge the mutual legal assistance decision
Solution extraite
Z. was not personally and directly affected because he was neither account holder nor proven former holder; being only economically entitled or mentioned in account records was insufficient.
Motifs extraits
Standing under the IRSG requires personal and direct impact and a protected legal interest. For bank records, the account holder is directly affected; a mere beneficial owner or third person mentioned in the files is not. No proof was provided that the legal entities no longer existed.