To filter which invoices are sent/not yet sent to Peppol use the filter in the invoices menu:

Once you've sent an invoice through the Peppol network, you can track its delivery status and check for any issues in the invoice audit trail.
To access this navigate to:

If something went wrong you can also see this in the audit trail.

You can also get to the audit trail of an invoice in the details window of an invoice by opening the "Events" collapsable.
