Key legal question
Whether the Belgian request was sufficiently motivated to allow Swiss mutual assistance and dual criminality review.
Extracted holding
The request and its supplement contained enough factual detail; the conduct could be treated as customs fraud equivalent to tax fraud under Swiss law.
Extracted reasoning
Although the initial request was somewhat confused, the supplement clarified the scheme, the appellant's role, and the use of false invoices and substitutions of goods. This was sufficient for motivation and dual criminality.