We have a client who invoices out of OE. We create the order, ship it, create the invoice and packing list all without issue.

What happens though is after the invoice has been created and the items are there waiting to be physically shipped to the customer (the order might sit there for a few hours) the customer might phone back and indicate we made a mistake on the order and instead of ordering 100 items we only want 10.

Yes, we can go the credit note route etc. but was curious is there was a quicker way of essentially "modifying" the invoice already created.

Hope this makes sense and thanks for any suggestions in advance.