I see. Rules are sometimes too much in some European countries.
Well, for the moment, it is not possible to edit the invoice reference. With v11, available in january, a hidden option “INVOICE_ALLOW_FREE_REF” has been introduced to experiment the capability to change reference of an invoice. But this will be possible as long as the invoice has the status “Draft” and only if your country is not in Europe. Do you think this feature in v11 will solve your need ?
