The Net Customer / Vendor Balances functionality in the Payment Journal only works when entering payment lines manually. When the Suggest Vendor Payments function is run first, followed by the Net Customer / Vendor Balances action, the system ignores the newly created lines as a result of the 2nd process and leaves the initially created vendor line as the total for the vendor-side only. Users have to manually update the amount on this line to be equal to the total net payment to be made. The suggestion here is to integration the Suggest Vendor Payments so that it can take into account lines suggested from the Net Customer/Vendor Balances report.