A Customer Credit Limit should be exactly that, a Limit. And a Limit of 0.00 should be exactly that, NO CREDIT. Currently the system sees 0.00 as unlimited, which is wrong. Currently, we have a template that assigns a Credit Limit of 0.01. However, we run into issues of being short paid by .01c. This then leads us to write-off a bunch of pennies. Also, a little green notification bar that states the customer is over their limit does not suffice. It should block the purchase entirely, with a possible exception to override with acknowledgement.