If you have made invoices with LISA, you can export them to the universal format UBL E-fff. This means that virtually any accounting program can read the invoices. Duplicate entries are history and you can import any invoice from LISA into the accounting system. By the way, E-fff is the format used to deliver your invoices via Peppol to the authorities. You can also have LISA Purchase automatically process your purchase invoices that are in UBL format.