When invoices are created, the main contact is included in the invoice address. If the main contact is changed for a client, the contact for all previous invoices is changed (so that when an old invoice is printed, the new main contact appears, rather that the old main contact to whom the old invoices went). Is there any way of keeping the main contact as shown on old invoices, when the contact for a new invoice is changed for a new invoice? Or, put another way, how can different contacts be included on different invoices for the same client?
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