Key legal question
Whether the federal appeal could challenge the cantonal finding that a trade usage allowed substitution for customs clearance tasks.
Extracted holding
The challenge was inadmissible or unfounded because the existence and content of the usage were factual findings binding on the Federal Tribunal.
Extracted reasoning
The appellant attacked only the factual finding of a commercial usage, not an erroneous legal concept of usage; such attacks are not reviewable in reform appeal except in narrowly defined circumstances.