Switzerland has denied a request from the Italian government to hand over an Italian Renaissance portrait that was once attributed to Leonardo da Vinci and offered for sale for more than $100 million.

Swiss police impounded the painting, “Portrait of Isabella d’Este,” in a bank vault in Lugano in 2015, at the urging of the Italian government, which said its Italian owner had failed to acquire the necessary export license to take the painting out of Italy.

Italy’s strict laws set forfeiture as the penalty for illegal export of cultural heritage.

But the Swiss Supreme Court said on Wednesday that the conditions for a handover are not met, overturning a ruling last year by the country’s federal criminal court. The criminal court had called for the painting to be transferred to Italy on the basis of mutual assistance in criminal matters.

The Supreme Court said a request based on international mutual criminal assistance conventions should only be met in the case of activity that is also criminal in the country receiving the request.