Set Customer F7 Issues

I'm trying to setup customer id cards The cards would have a bar code and cashier would scan them. I have two problems i'm running into.

1. When cashier presses F7 and scans the card unless the focus is on "ACCOUNT" the software can select wrong customer. Also if the a item bar code is scanned or a wrong card is scanned t will select some account instead of prompting the cashier . The focus can be changed if manual customer look up by name is used . Is there a way to prompt the cashier if the customers card( customer number) is not found.

Is there a way to block cashiers from using manual look up?

Thanks for any help

Robert, If you find the solutions that Jeff posted are not working consistenly enough for you, we also have a program called Express Customer Setup that, among other things, can take a swipe from a loyalty card at the beginning of a transaction and set the customer for you. If you are interested in learning more, please drop me an email.