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This is because refund information is not printed on our invoices.
We follow GAAP (Generally Accepted Accounting Principles) which means that administrative changes should be documented separately. This means that an original invoice should never be modified by a refund. In most countries (at least in the EU) this is even considered fraudulent (and illegal). We have chosen to follow this in both the free and the paid extension.
To solve this, you would need our Professional extension. With it you can create credit note documents that hold the refund information.
If you would like to know more about this, email us at [email protected], as we’re not allowed to discuss paid plugins on the forums