Flow Of Default Values in Payables

•  Defaults set at higher levels flow down to lower levels where you can override them. 
• Defaults reduce data entry by providing default values

Note : Changes to default values affect only new records, not existing records.  For example, if payment terms in the Payables Options window are reset to Net 30 from Net 45, new suppliers will have a default of Net 30.  Existing suppliers will have terms of Net 45.

Updating Supplier and Supplier Site Defaults :

For example, if you change the Pay Group for a supplier site, the new Pay Group will default to new invoices you enter, but the change will not affect existing invoices. Also, if you change a supplier value that defaults to supplier sites, the change will only affect new supplier sites you create, but the change will not affect existing supplier sites. Therefore, the change will not affect documents you subsequently create for existing supplier sites. If you want a change to affect documents you enter or create for an existing supplier site, be sure to make the changes at the supplier site level.