This screen is used to create/view/edit the Supplier Account Type lookups. These are used to set the Account Types available on the Supplier (Organisation and Person) create/edit screens.

The fields are as follows:

Name - the account type
Payment Terms and Payment Terms Units - the supplier's payment terms
Active - uncheck the box to deactive the account type

Note that the system contains no automatic payment processing system which would make use of the Payment Terms fields to pay only invoices that are due (and this functionality is usually handled by the accounting system).  However, it is quite possible to build a supplier payments due report that would use these fields.