Create a new Record from a Record : warning skipping _

Hi Isomorphic,

For a specific behavior I need to create a record from an existing record and remove a specific attribute to skip the validation on this field.

I create the record with the constructor record(Map)

Code:

Map map = getMasterRecord().toMap();

map.remove(DSOperator.LOGIN);                

DSRequest req = new DSRequest(DSOperationType.UPDATE, null,new Record(map));

req.setValidationMode(ValidationMode.PARTIAL);

statusForm.saveData(new DSCallback() {

...                                

}, req);

When creating the new record I got a warning "WARN:Log:JSO::convertMapToJavascriptObject : skipping __ref in map"

Is there a way to avoid this warning?
What is the __ref attribute in a record? What does it means?
Is there a better way to create a new record from an existing record?

Regards

Ju