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Tip of the week: Check customer's operator for electronic invoices:
We have recently implemented a change, where the operator ID is also forwarded with electronic invoices. If the wrong operator is on the invoice, it will result in a sending error. It's important to choose the right operator and the right e-invoice address in the customer register and on sales invoices. If you are using an integration to import invoices, check customers' operator information.
You can find more information in our Manual.
Procountor API Developers