When Posting an invoice, Younium takes the invoice draft, allocates an invoice number and post transactions and integration.
It will result in transactions in Younium and in your journals that are to be imported to your CRM. Your invoice will also be sent, either from Younium or from your integrated ERP.
A posted invoice can not be undone. If an order has been invoiced it is not possible to change the order version without generating new invoices (if new values have been set).
Its possible to verify that the invoice is correct at draft stage before posting the invoice.