I wrote about this in the past:
I would like to suggest that you increase the % so we can do quick refunds from the tag button.
I have already both on my bank account, I click tag on the invoice and the click tag on the refund to link it to the same invoice, but the second does not work because is .02 bigger than the invoice.
When is .02 smaller it works, but for bigger it does not.
I want to suggest to add a 10% margin there so we can select invoices even if they are smaller than the refund.