Credit limit

 Hi to all,

I have the following situation:

1. I have different customers in AR and for my client they are related customers. Normally, each customer has its own credit limit.

I want to know is there is a way to do this:

Lets say Customer A has credit limit for 1000 USD. Customer B has credit limit for 2000.

For my client, both customers are related.

If Customer B is now on its credit limit, and Customer A wants to buy something, I need the application not to allow to do a sales order even though Customer A still has credit limit.