Questão jurídica principal
Whether the appeal filed by Rechtsanwalt Z. on behalf of K. was validly authorized
Decisão extraída
The appeal was filed without a valid power of attorney and could not be entertained.
Fundamentação extraída
The submitted mandate dated 2010 was not in Z.'s name, no valid substitution from S. was shown, and a later mandate to another lawyer indicated that Z. was no longer authorized. The defect could not be cured retrospectively.