Change to Payment Amount gets dropped during the final submission

When processing payments that have been generated through a payment template, we often manually update the "Payment Amount" to be less than the "Amount Remaining" shown to be paid in the "Selected Scheduled Payments" page of the "Process Payment Requests".   We frequently will have 20 or more of these manual updates on batches that have between 200 and 300 invoices.  When we submit the batch, a single one of these updates is being dropped, even though we have saved the change and verified our totals before submitting.

After submitting, the amount that was displayed in the "Selected Scheduled Payments" does not match the output of the "Request Status Report" that is generated.  The difference is always a manual update to the Payment Amount for a single invoice.  This results in an overpayment to the supplier if it is not caught.  If it is caught, it results in the user having to reprocess the entire batch, which cam be a significant amount of effort.  This can also happen multiple times for the same batch and has happened for more than one user.  The manual payment amount dropped is