Hi!
Yes, the goal is to print the invoices. Legally we must have invoices that follow numerically. So we cannot make a credit invoice with the same number as the debit invoice.
I am now trying to follow your advice and adjust the invoice through the order back-end. I have tried to ways.
a:- I add a coupon with the amount being the negative of the order amount;
b:- I add a product with the negative amount of the total amount.
However, in both cases the invoice still quotes the total sales tax amount. In the coupon for instance I don' t have the option to set that to nil. The system holds fast to the 21% sales tax. Which will get me into trouble with the bookkeeper.
So I can neither bring the same invoice down to nil (also for the sales tax), nor create a new invoice for the full credit amounts?