I have a VERY similar issue! I have an invoice not a receipt that I need to adjust for $80 to correct the problem with my customer! The answer from  :Kevin"?  was very good he actually read you issue, but it wasn't accurate as there was no "dialog box" to adjust the amount of the refund. I simply need to get $80 back to my customer that paid via credit card. It's disgusting how I pay over $1000 a year for this product and when I come to these help discussions. All the support people do is  refer you to something else and here's a perfect example where there's contradiction in the answers they can't even answer you correctly it's disgusting for $1000 a year.