[Feature Request] Clone into: Negative Invoice (invoice correction)

Problem In europe it's technically unlawful to change an invoice afterwards. In germany there's a concept of negative invoices or invoice corrections if you made a mistake within an invoice and you need to correct that. Technically, a credit note, from a tax law perspective is something completely different and does not server the purpose. [Explanation]( -> ymu: Browser Translation). Solution • Add the option to clone the invoice into a negative invoice. Everything is kept as is except for the items. They adopt the opposite value. Which creates the invoice as a new and negative invoice. A new textfield must be added which sais: • Clone into options may be subject of becoming optional items one could enable/disable. Implication • Mark the referenced invoice as paid with negative amount. Totale Reduces human errors and raises UX. --- • Please use the 👍 [reaction]( to show that you are interested into the same featur…