How to attribute a refund to an invoice that had to be modified?

[Maf King]

On Thursday 12 May 2011 22:58:39 John Griessen wrote:
> I have to modify some invoices when I can't ship what was billed.  Is there
> any tidy way in gnucash to attribute a refund to an invoice?  In other
> words, I have a payment for $65, and a modified invoice for $54., so I
> need to refund $11, and I want that to stay related to the original
> invoice...  I can't process a payment for a negative amount though, even
> though that is just what I want to do... a refund.
> 
> John Griessen

Hi John,

In the past I have handled this sort of situation by amending the original 
invoice in GC, to add a "credit/refund" line, with explanation in the notes.

HTH,
Maf.