Adjusting the amount for a single future payment is easy. You can do it from a few locations in the system:
From the Contract Entry
Navigating to the second tab of the contract entry, you will find a list of all future payments related to this contract. You can click a row to open up the scheduled payment entry for that date.
Once there, you can quickly adjust and save the new billing amount.
This will be reflected back on the list of future payments
From the Billing Schedule
From the Billing Schedule listing (for any date range), you can click the two arrows in the Account column to open up a dialog for adjusting the payment account as well as the amount
