No, that's not a problem. In fact, I think it's informative. In essence, it is an alert that the customer may (depending on his/her bank's policies and practices) be able to use the ATM to withdraw $100 even though the balance is only $50, and may incur an overdraft fee as a result.
_________________________
John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8