Sage 100

In AP Electronic Payment (guessing same would hold true for payroll DD), if you enter an invalid routing number, Sage throws a message that it's invalid. To what database is it validating against and do we have access to it? Customer is asking is indicating they have some routing numbers getting through but are marked invalid by the bank?

Check this out http://www.brainjar.com/js/validation/

If that is what Sage is doing it is not enough. It can be valid but not is use...

IMHO, that's what a pre-note is for. Sage could also validate that it is valid AND is in use...and it could still be the wrong routing for that vendor/employee. Data Entry/vendor/employee has to take responsibility at some point.