Also, I don't know if this is just a coincidence, but we started seing this behaviour with failed release the last few days, after we also started creating attachments for all the invoices. So we: - Save the invoice - Create the attachment for the invoice (same attachment file for all invoices) - Release the invoice All the steps succeed without errors, but som invoices never get released. Edit: Also, we handle invoices in parallell. We always perform the steps above in the order described for the same invoice, but we send calls for different invoices in parallel. This shouldn't be a problem, right? We comply to the rate limits att all time, maximum calls/h, max concurrent calls and so on, and we never get any error codes of any kind.
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