This is not a feature of the native Sage 500 code base. It's possible to do but would require some custom programming, so you would have to compare that with the cost of maybe hiring a temp to do the work. A custom solution could use the various APIs to create credit memos, some select mods to the finance charge base code, or you could build a UI customization for Process Cash Receipts:

www.sagecity.com/.../70-000-unapplied-payments-in-sage-500--

There are some aspects of the configuration of the customer and AR options that would potentially need to be verified if write offs are done manually or with Customizer. The Allow Write Offs on the Defaults tab in Maintain Customers must be enabled and the Maximum Write Off Amount on the Other tab of Set Up AR Options would have to equal or exceed the invoice amount.

This is not a feature of the native Sage 500 code base. It's possible to do but would require some custom programming, so you would have to compare that with the cost of maybe hiring a temp to do the work. A custom solution could use the various APIs to create credit memos, some select mods to the finance charge base code, or you could build a UI customization for Process Cash Receipts:

www.sagecity.com/.../70-000-unapplied-payments-in-sage-500--

There are some aspects of the configuration of the customer and AR options that would potentially need to be verified if write offs are done manually or with Customizer. The Allow Write Offs on the Defaults tab in Maintain Customers must be enabled and the Maximum Write Off Amount on the Other tab of Set Up AR Options would have to equal or exceed the invoice amount.