What is the business/functional usage of Invoice properties ?

Once they are entered on property code window of Supplier and Customer, where those could be subsequently viewed or queried ?
What is the business/functional usage of Invoice properties ?
Once they are entered on property code window of Supplier and Customer, where those could be subsequently viewed or queried ?
I have noticed the help text, but I could not locate the property code reflected under purchase order, customer order Supplier invoice , and customer invoice etc.?
Customer/Invoice Tab:
Supplier Invoice Tab (default to PO because of supplier basic data):
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.