There are three problems that I know of with the customer credit limit functionality in terms of real-world usability. The descriptions below of these problems assume a customer with a credit limit of $100, no open transactions in NetSuite, and two separate $100 PO's faxed in.

1. Open sales orders are not included in the credit limit checking. In the example above, both sales orders would be accepted without any warning by NetSuite because it only checks the sales order you're entering against the customer's current balance. However, the second SO should be blocked because it might cause the customer to go over their limit, and exceeding the limit is a Finance decision not Sales. NetSuite should check the credit limit against the current balance + SO being entered + open SO lines (currently it does not take into account other open SO lines). Enhancement request#