Reprint Invoices

 Client is using BPA for invoices.  When customer tombstone data is updated this flows through to invoice, and shows in both the online view and the reprinted document.  Reprint shows new and updated information.  Client wishes to be able to update customer information but mantain original invoice as legal document should the need arise.  Reprinting from concurrent mgr not an option as this is purged regularly.

I am sure this is not a new requst to many on this board and I would welcome any and all suggestions for an archiving strategy to maintain original invoices for reprint.