Vendor Payment Code

I am looking for best practice in regards to the default setting for vendor payment codes in AP10. Our default setting is set to SYS. We have some vendors set up with a payment code of ACH on AP10 that have multiple remits (locations). These remits will pull as ACH and not SYS because of how the vendor is set up on the main screen in AP10. Idealy we want the system default setting to drive the payment code and not have to override it in the remit (location) forms. Any input or thought is welcome. Thank you