Credit management-sales value

Hi

Sales value showing incorrect value in credit management(FD32-Transaction code)

Sales value is determined based on following formula

Sales value = Open delivery/invoice - Open order

Open Delivery/Invoice: 162,812.52 (go to environment>sales and distribution doc > Open delivery/Invoice

I would like to know that what are the Open delivery number. Because by checking open delivery status the value is not matching with above Open delivery value = 162,812.52

Kindly let us know how to get delivery no/Invoice no to identify and match sales value.

Regards

Pinal