Custom Button - Update Quote as "fermé" (Closed)

Custom Button - Update Quote as "fermé" (Closed)

Greetings,

I try to create a Custom Button to update the field "Statut du Devis" (status of the quote)

mp = Map();
mp.put("Statut du Devis","Perdus fermés");
update = zoho.crm.updateRecord("Quotes",quoteID.toLong(),mp);
info mp;
info update;
return "Success" + quoteID.toLong();

The function pass but nothing happen.
"Statut du Devis" remain the same.
What should I do ?

Thanks.