Odoo Peppol problems usually begin long before anyone clicks Send. A customer record may be incomplete, a tax rule may be wrong, a delivery may still be disputed, or nobody may own the exception queue. By the time an invoice fails, the real cause can be buried several steps earlier in the process.

An Odoo implementation that runs late is not automatically a failed project. There is a point, though, where waiting costs more than acting. How to recognise that point, and which route gets your system working again.