Hello - We have a list of Invoices created with the wrong tax code due to someone changing the tax code on the customer. We reverted the change on the customer, but the correct tax code is not in the list when we try to update the line items on the invoice. • Easiest way to change this? or do we need to re-issue invoices? New invoices have the correct tax code and on the existing ones if I add a new line it will also reflect the correct tax code. Thanks

There is no simple answer, it really depends - both on what country you are in, how long ago it was, and whether any integration (or even email function) picked them up yet. As long as period is not closed, payment has not been booked and no one but yourselves looked at them, then you can change, otherwise its re-issue time.