You receive an e-mail with the subject

• READY TO SEND and the message to log into SupplyOn eInvoicing. Open the "Ready to send" tab and click on Send.
• DRAFT and the message that the invoice has been uploaded, but the validation was not successful.
  • Error correction: Log into SupplyOn eInvoicing, open the Draft tab, search for the invoice with the Error status, open it, click Check, remove the error and click Send.