Sales orders batched in Channel but need to be used for Accrual calculation

Summary:

A customer program is created and there are sales order invoices that need to be included in the accrual calculation, however, the records are already batched in channel. If it's a Volume program, a manual adjustment cannot be made to "catch up" the accrual.

What is the best practice for correcting the accruals that need to be calculated as part of this program?

Do the sales order lines need to be manually reloaded into Channel via CSV to be included in the calc?

Or Do we create a lump sum program with amount for the difference? Open to ideas as this is a frequent scenario when same customer is part of multiple programs. Without the ability to manually adjust the accrual for volume based program, we are stuck.