Actually, I just pointed out that our Adagio Invoices module supports a 12 character invoice number, if all you were trying to do is generate an invoice (and not process an order). You would have to change modules for your invoicing. Otherwise you're going to have to decide which 8 characters from your enginneering software you want to pass to the accounting.
While changing the size of the invoice number in Adagio OrderEntry is planned for some time in the future, that date is too distant to be useful to you since the changes to the engineering software have already been done.
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Andrew Bates