Invoice number format not being changed

Hello,
I changed the invoice number format to
{id size="4"} - {date format="yy"}

but when I create a new test confirmed order in backend and then click the "invoice" button, the generated invoice number is still the same as the order number ( {automatic_code} ), while I was expecting it to be "000X - 18" , where X is the invoice ID

Am i missing something here?

Thank you

Hi,

The invoice number is only generated when the order status of the order is changed to one of the statuses enabled under the "invoice" column of the System>Order statuses menu.
Otherwise, when the invoice number is not yet generated and you click on the "invoice" button, the invoice uses the order number.