Difference between the Open Order Value used in Static check and the one used in Dynamic Check?

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