Thanks for your quick answer.
I have modified table invoice_items. I’ve added some fields in there.
Then I’ve modified a couple of archives in folder modules/invoices.
It works great when I save the invoice. The only problem is when I try to add a new row or a new article.
The cells where I have to write the information I want don’t appear. Like in the photo.
I mean. I have 11 fields to fill in the invoice. When I add a new row or product only appear 6 fields in the row recently created.