Key legal question
Whether the appellate court correctly determined a supplementary sentence under retrospective concurrence (Art. 49(2) StGB).
Extracted holding
The appellate court had to determine a hypothetical overall sentence under the asperation principle and then deduct the earlier sentence; it instead assessed the supplementary sentence in isolation.
Extracted reasoning
Retrospective concurrence requires treating the offenses as if judged together so that the offender is not punished more severely due to separate proceedings. The lower court failed to weigh all prison sentences together and thus disadvantaged the defendant.