The self checkouts at my local Walmarts already do this. When an error occurs it flags for help but lets me proceed up until it is time to pay. By then usually

The self checkouts at my local Walmarts already do this. When an error occurs it flags for help but lets me proceed up until it is time to pay. By then usually an associate has already made their way over to check the errors in batch vs 1 at a time as they come up. It's so much nicer of an experience compared to machines that just stop functioning until an employee can "help" you.