6 votesmatthew.morgan commented
Currently, an invoice gets a stamp placed at the top of the invoice, when an invoice is refunded if you are using a custom invoice template there is no way of changing the style, positioning or sizing the stamp. also, companies that are ISO Accredited need invoices and credits/refunds to be clearly marked as such at the top of the document.
i.e the pdf would have INVOICE or CREDIT at the top of the document depending on what it is
This makes it clear when a document goes to a company's accounts it is easy to identify what the document is.
Two ways that I can think of solving this issue are
1) Customization of the stamp, Custom image, Size, Position etc
2) Separate Invoice and Refund Template