Key legal question
Whether the cantonal decision was a separately appealable partial decision or only an interlocutory decision.
Extracted holding
The challenged judgment was not a partial decision but an interlocutory decision because it opened participation of an additional party rather than ending proceedings for one party.
Extracted reasoning
Article 91(b) BGG on subjective joinder did not apply. The proceeding before the department continued regardless, so the decision did not conclusively end the matter for any participant.