I was searching for Grid remote validation and I reached your demo demo.
I Have two questions .
1-In this demo validator shows the error message but accepts the input.is there any way that we prevent adding record to data base when remote validation result is false?
in your demo I have added many of the same name product and validation does not prevent me doing this.
2-this message is not shown for editing. but I could not find how you handled this is source.