isometric map and map:scale()

I’m trying to scale an isometric map (but tried also with ortogonals) with no success

map = loadMap("test2.tmx")  
map:scale(2, 2)  

my config

application =   
{  
 content =   
 {  
 antialias = true,  
 width = 480,  
 height = 800,   
 scale = "letterbox"  
 }  
}  

someone can help? [import]uid: 108637 topic_id: 32701 reply_id: 332701[/import]