Kernrechtsfrage
Whether the appeal against the Obergericht's cost decision was admissible at this stage.
Extrahierter Entscheid
The cost ruling formed part of a remittal/interim decision and could only be challenged after a final decision in the merits; no exceptional irreparable harm was shown.
Extrahierte Begründung
A remittal decision is an interim decision. Cost allocation made in that context is likewise only an intermediate step in the overall proceedings and is generally reviewable together with the later final merits decision. The appellant invoked no special circumstances requiring immediate review.