Tell me the difference between Static and Dynamic Credit Checks. 
What is the difference between the Open Order Value used in Static check and the one used in Dynamic Check?

*Simple Credit Check :* Tr.Code - FD32

It Considers the Doc.Value + Open Items.

Doc.Value : Sales Order Has been saved but not delivered

Open Item : Sales Order has been saved , Delivered, Billed & Transfered to FI, but not received the payment from the customer.

*Static Credit Check* it checks all these doc value & check with the credit limit

1) Open Doc.Value / Sales Order Value : Which is save but not delievered

2) Open Delivery Doc.Value : Which is delivered but not billed

3) Open Billing Doc.Value : Which is billed but not posted to FI

4) Open Item : Which is transfered to FI but not received from the customer.

*Dynamic Credit Check*         1) Open Doc
                                                   2) Open Delivery
                                                   3) Open Billing
                                                   4) Open Items
                                                   5) Horizon Period = Eg.3Months

Here the System will not consider the above 1, 2, 3 & 4 values for the lost 3 months.