Comment by 6510

Most important is for it to have the right number consistently without room for error. You may also use multiple sequences like if you sell cars and crates of bananas you wouldn't want to mix those but you would want to use a single tool.

Anything else can be corrected. It is important to easily make corrections and/or credit nota as those seem to happen at the worse time. Usually the same as the invoice but with amounts in the -

It is also nice to tie the products into it so that you don't have to type it every time and get consistent naming. Same for an address book.