Hi SGG,
I`m not sure I understand the business scenario behind your question but you could potentially use the "Apply payment schedule" functionality to "split" the invoice into 2 portions:
- the debit memo amount
- the amount that will be paid
Once you`ve done this you can:
* settle the portion excluding the debit memo amount
* decide what to do with the debit memo portion (write off...).
Follow these steps to "split" the invoice:
* Open customer invoices -> Select relevant invoice -> Under Invoice tab - Settle open transactions
* Mark invoice then click on "Apply payment schedule"
* Percentage/amount: Amount
* Create 2 new lines: one with the debit memo amount and one with the rest