delivery credit check

Dear friends

I have analyzed one customer, at present time During Sales order creation credit limit checking, we have created one sales order in development server with credit limit... We cannot make the delivery for that sales order. Now we have removed credit limit risk category 100 from that customer .We need this sales order delivery but during creation of delivery show Error: Oldest of Open Item Overdue. We want to check the credit limit at the time of delivery creation only.pls help me in this matter

regards

siddu