Relation between "Order Credit Limit" (in Customer setup) and "Maximum Days Past Due" (in Exposure

Hi,

I have a query regarding the relation between "Order Credit Limit" (in Customer setup) and  "Maximum Days Past Due" (in Exposure tab-page of Credit Check Rules).

1. Say a customer has a credit limit of $50,000 and has only used $40,000 of the credit limit (including open AR and uninvoiced orders) and the new order value is $5,000. The Maximum Days Past Due on the rule is 90 days. The customer has 1 invoice past due 100 days.
The order will go on hold because of the 1 invoice that is 100 days past due,even though the total credit exposure will only be $45,000.

Now if the above scenario is repeated with the credit limit set to NULL (both at customer level and site level) will the new order still go on hold?