Problem with the webix.proxy

I have a problem with webix.proxy : when i call 1st time the save function of the form, the save function from proxy is called, but the 2nd time it is not called.

{
     $proxy:true,
     load:function(self) {
          console.log("proxy load");
          self.load("/restapi/admin/clients")
     },
     save:function(view, data, dp, callback) {
          console.log("proxy save");
          console.log("This operation : " + data.operation);
          console.log(data.data);
     }	
}

$$("form").save();

What am I doing wrong ?

You need to trigger data saving callback from save handler. Component will pause all further save calls while response from the first save call is not received.

save:function(view, data, dp, callback) {
    callback.success();
}