Questão jurídica principal
Whether the appeal against the arrest decision was admissible as a full civil appeal or only as a constitutional complaint against a precautionary measure.
Decisão extraída
An arrest decision is a precautionary measure within Art. 98 BGG; only constitutional rights may be invoked, and the court reviews only sufficiently substantiated grievances.
Fundamentação extraída
Arrest serves solely to secure future enforcement, has no independent substantive legal effect, and is provisional because it depends on prosecution of the arrest and can be neutralized by security; therefore it falls under the regime for precautionary measures.